diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d6bfbf01f..d7c9ef1f3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,59 @@
+# This script sets up a Continuous Reproducibility system for GNSS-SDR at GitLab
+#
+# Useful links:
+# Website: http://gnss-sdr.org
+# Upstream repository: https://github.com/gnss-sdr/gnss-sdr.git
+# Dockerfile at https://github.com/carlesfernandez/docker-gnsssdr
+# Docker cloud image: carlesfernandez/docker-gnsssdr
+#
+# In order to use this system and be able to make changes, you will need:
+#  - A GitHub account https://github.com
+#  - A GitLab account https://gitlab.com
+#  - A Docker Hub account https://hub.docker.com
+#  - A repository at Docker Hub.
+#
+# In order to use this system, please fork at GitHub the upstream
+# repository; import that forked repo at GitLab; then add, commit and push to
+# your GitLab repo this .gitlab-ci.yml file; and finally go to your project page
+# at GitLab and set up the following secret variables. In the left panel:
+# Settings > CI / CD > Secret variables
+#
+# CI_REGISTRY_USER     <- Leave it blank
+# CI_REGISTRY_PASWORD  <- Leave it blank
+# DOCKER_HUB_USER
+# DOCKER_HUB_REPO
+# DOCKER_HUB_PASSWORD
+#
+# For instance, my settings are:
+# CI_REGISTRY_USER = carlesfernandez
+# CI_REGISTRY_PASWORD = ********************
+# DOCKER_HUB_USER = carlesfernandez
+# DOCKER_HUB_REPO = docker-gnsssdr
+# DOCKER_HUB_PASSWORD = ********************
+#
+# If you want to make changes in the source code, please branch-off from the
+# 'next' branch of your forked repository and, if needed, add new jobs in this
+# file at the 'deploy' and 'experiment' stages. You can also change the
+# DOCKERFILE_URL variable below if your changes in the source code require extra
+# packages or build steps.
+#
+# Feel free to delete the docker-gnsssdr and docker-pybombs-gnsssdr jobs,
+# they are for developers' team only. Actually, this is their CI/CD system.
+#
+# More info about how to contribute to GNSS-SDR at
+# https://github.com/gnss-sdr/gnss-sdr/blob/master/CONTRIBUTING.md
+#
+# (C) Carles Fernandez-Prades, 2018 cfernandez@cttc.cat
+
+variables:
+  DOCKERFILE_URL: "https://raw.githubusercontent.com/carlesfernandez/docker-gnsssdr/master/Dockerfile"
+
+
 # Is performed before the scripts in the stages step
 before_script:
   - source /etc/profile
 
+
 # Defines stages which are to be executed
 stages:
   - build
@@ -9,6 +61,7 @@ stages:
   - deploy
   - experiment
 
+
 # Stage "build"
 debian8.10:
   image: debian:8.10-slim
@@ -146,25 +199,43 @@ docker-gnsssdr:
   allow_failure: true
 
 
+docker-pybombs-gnsssdr:
+  image: docker:latest
+  stage: deploy
+  services:
+    - docker:dind
+  script:
+    - wget https://raw.githubusercontent.com/carlesfernandez/docker-pybombs-gnsssdr/master/Dockerfile
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD"
+    - mkdir docker-build
+    - cd docker-build
+    - cp ../Dockerfile .
+    - docker build -t carlesfernandez/docker-pybombs-gnsssdr .
+    - docker push carlesfernandez/docker-pybombs-gnsssdr
+  only:
+    - next
+  allow_failure: true
+
+
 docker-access18:
   image: docker:latest
   stage: deploy
   services:
     - docker:dind
   script:
-    - wget https://raw.githubusercontent.com/carlesfernandez/docker-gnsssdr/master/Dockerfile
-    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD"
+    - wget $DOCKERFILE_URL
+    - docker login -u "$DOCKER_HUB_USER" -p "$DOCKER_HUB_PASSWORD"
     - mkdir docker-build
     - cd docker-build
     - cp ../Dockerfile .
-    - docker build -t carlesfernandez/docker-gnsssdr .
-    - docker tag carlesfernandez/docker-gnsssdr:latest carlesfernandez/docker-gnsssdr:access18
-    - docker push carlesfernandez/docker-gnsssdr:access18
+    - docker build -t $DOCKER_HUB_USER/$DOCKER_HUB_REPO .
+    - docker tag $DOCKER_HUB_USER/$DOCKER_HUB_REPO:latest $DOCKER_HUB_USER/$DOCKER_HUB_REPO:access18
+    - docker push $DOCKER_HUB_USER/$DOCKER_HUB_REPO:access18
 
 
 # Stage "experiment"
 run-access18:
-  image: carlesfernandez/docker-gnsssdr:access18
+  image: $DOCKER_HUB_USER/$DOCKER_HUB_REPO:access18
   stage: build
   script:
     - apt-get update
@@ -175,11 +246,11 @@ run-access18:
     - cd data
     - curl https://zenodo.org/record/1172670/files/L2_signal_samples.tar.xz --output L2_signal_samples.tar.xz
     - tar xvfJ L2_signal_samples.tar.xz
-    - md5sum L2_signal_samples.dat > data.md5
+    - echo "2090ad3dfb3f461314252a1e6243d714  L2_signal_samples.tar.xz" > data.md5
     - md5sum -c data.md5
     - cd ..
     # Execute the experiment (example)
-    - echo " x = 0:0.01:3; hf = figure (\"visible\", \"off\"); plot (x, erf (x)); hold on; plot (x, x, \"r\"); axis ([0, 3, 0, 1]); text (0.65, 0.6175, ['$ \leftarrow x = \frac{2}{\sqrt{\pi}} \int_{0}^{x}e^{-t^2} dt = 0.6175 $']); xlabel (\"x\"); ylabel (\"erf (x)\"); title (\"erf (x) with text annotation\"); hh=findall(hf,\"-property\",\"FontName\"); set(hh,\"FontName\",\"Times\"); hh2=findall(hf,\"-property\",\"interpreter\"); set(hh2, \"interpreter\", \"tex\"); hh3=findall(hf,\"-property\",\"FontSize\"); set(hh3, \"FontSize\", 22); print (hf, \"results.eps\", \"-depsc\"); " >  my_test_file.m
+    - echo " x = 0:0.01:3; hf = figure (\"visible\", \"off\"); plot (x, erf (x), \"linewidth\", 2); hold on; plot (x, x, \"r\", \"linewidth\", 2); axis ([0, 3, 0, 1]); text (0.65, 0.6175, ['\leftarrow x = \pi \int_{0}^{x}e^{-t^2} dt = 0.6175 ']); xlabel (\"x\"); ylabel (\"erf (x)\"); title (\"erf (x) with text annotation\"); hh=findall(hf,\"-property\",\"FontName\"); set(hh,\"FontName\",\"Times\"); hh2=findall(hf,\"-property\",\"interpreter\"); set(hh2, \"interpreter\", \"tex\"); hh3=findall(hf,\"-property\",\"FontSize\"); set(hh3, \"FontSize\", 22); print (hf, \"results.eps\", \"-depsc\"); " >  my_test_file.m
     - octave --no-gui my_test_file.m
     - epspdf results.eps results.pdf
     - mkdir access18