let's say the draft is ready

docs/references.bib

@@ -37,11 +37,27 @@
 @misc{ros,
     title={{ROS.org | Powering} the world's robots},
     howpublished={\url{http://www.ros.org/}},
-    note={Accessed: 2019-01-03}
+    note={Accessed: 2019-03-01}
 }
 
 @misc{naoqi,
     title={{NAOqi} Developer guide},
     howpublished={\url{http://doc.aldebaran.com/2-1/index_dev_guide.html}},
-    note={Accessed: 2018-08-08}
+    note={Accessed: 2019-03-01}
+}
+
+@misc{yaml,
+    author = {Ben-Kiki, Oren, and Evans, Clark and Ingerson, Brian},
+    title = {{YAML} ain't markup language version 1.1},
+    howpublished={\url{http://yaml.org}},
+    year = {2005},
+    note={Accessed: 2019-03-01}
+}
+
+@article{jacobian,
+    author = {Buss, Samuel R.},
+    title = {Introduction to inverse kinematics with jacobian transpose,
+        pseudoinverse and damped least squares methods},
+    journal = {IEEE Journal of Robotics and Automation},
+    year = {2004}
 }