Added some missing refs

README.md

 ### PbDLib C++ Library ###
 
-http://programming-by-demonstration.org
-
-
 Copyright (C) 2014, Davide De Tommaso, Milad Malekzadeh, Leonel Rozo, Tohid Alizadeh
 
     PbDLib is free software: you can redistribute it and/or modify
@@ -19,31 +16,88 @@ Copyright (C) 2014, Davide De Tommaso, Milad Malekzadeh, Leonel Rozo, Tohid Aliz
     along with PbDLib.  If not, see <http://www.gnu.org/licenses/>.
 
 
+# 1. What's PbDLib ?
+
+PbDLib is an open source C++ library for using the Programming-by-Demonstration machine learning tools in your C++ code. Most of the tools provided by PbDLib are implementations of the algorithms described in the book "Robot Programming by Demonstration: A Probabilistic Approach" (Sylvain Calinon, 2009) and other related scientific publications.
+
+For more information please visit http://programming-by-demonstration.org
+
+
+# 2. Contributors:
+
+PbDLib has been developed as part of the research activities inside the Learning and Interaction Group, Advanced Robotics Dept at the Istituto Italiano di Tecnologia, Genova.
+In the following the list of the contributors
 
-# Contributors:
     Davide De Tommaso ----> dtmdvd[at]gmail[dot]com
     Milad Malekzadeh  ----> milad[dot]malekzadeh[at]gmail[dot]com
     Leonel Rozo ----------> ing[dot]leonelrozo[at]gmail[dot]com
     Tohid Alizadeh -------> tohid[dot]alizadeh[at]gmail[dot]com
 
+For more information about research please visit 
+http://www.iit.it/en/advr-labs/learning-and-interaction.html
 
 
-# 1. Compiling instructions
+# 3. Compiling instructions
 
 
     ### 1.1 Dependences (you can find in deps directory)
 	(1) Armadillo C++ versions >3.9
-	(2) cmake
+	(2) CMake
 
     ### 1.2 Building
-
-	$ cd directory_of_the_pbdlib
 	$ mkdir build
 	$ cd build
 	$ cmake ..
 	$ make
 
     ### 1.3 Testing
-	$ cd directory_of_the_pbdlib
 	$ cd build/test
 	$ ./test_datapoints
+
+
+# 4. Some useful citations
+
+Did you find PbDLib useful for your research?
+Please consider to acknowledge the authors in any academic publications that have made use of this code or part of it. In the following you can find some code related BibTex references:
+
+
+@book{Calinon09book,
+	author="S. Calinon",
+	year="2009",
+	title="Robot Programming by Demonstration: A Probabilistic Approach",
+	publisher="EPFL/CRC Press"
+	note="{EPFL} {P}ress {ISBN} 978-2-940222-31-5, {CRC} {P}ress {ISBN} 978-1-4398-0867-2"
+}
+
+@article{Calinon07SMC,
+  	title="On Learning, Representing and Generalizing a Task in a Humanoid Robot",
+  	author="S. Calinon and F. Guenter and A. Billard",
+  	journal="IEEE Transactions on Systems, Man and Cybernetics, Part B. Special issue on robot learning by observation, demonstration and imitation",
+  	year="2007",
+  	volume="37",
+  	number="2",
+  	pages="286--298"
+}
+
+
+@inproceedings{Calinon14ICRA,
+	author="Calinon, S. and Bruno, D. and Caldwell, D. G.",
+	title="A task-parameterized probabilistic model with minimal intervention control",
+	booktitle="Proc. {IEEE} Intl Conf. on Robotics and Automation ({ICRA})",
+	year="2014",
+	month="May-June",
+	address="Hong Kong, China",
+	pages="3339--3344"
+}
+
+
+@inproceedings{Calinon12Hum,
+	author="Calinon, S. and Li, Z. and Alizadeh, T. and Tsagarakis, N. G. and Caldwell, D. G.",
+	title="Statistical dynamical systems for skills acquisition in humanoids",
+	booktitle="Proc. {IEEE} Intl Conf. on Humanoid Robots ({H}umanoids)",
+	year="2012",
+	address="Osaka, Japan",
+	pages="323--329"
+}
+
+

include/pbdlib/pgmm.h

@@ -125,4 +125,34 @@ class PGMM_Model
 };
 
 } // end of namespace pbdlib
+
 #endif
+
+/*
+ |
+ |  >> REFERENCES <<
+ |
+ |    [Calinon, ICRA14]
+ |           @inproceedings{Calinon14ICRA,
+ |			author="Calinon, S. and Bruno, D. and Caldwell, D. G.",
+ |			title="A task-parameterized probabilistic model with minimal intervention control",
+ |			booktitle="Proc. {IEEE} Intl Conf. on Robotics and Automation ({ICRA})",
+ |			year="2014",
+ |			month="May-June",
+ |			address="Hong Kong, China",
+ |			pages="3339--3344"
+ |           }
+ |
+ |
+ |    [Calinon, 2012]
+ |           @inproceedings{Calinon12Hum,
+ |			author="Calinon, S. and Li, Z. and Alizadeh, T. and Tsagarakis, N. G. and Caldwell, D. G.",
+ |			title="Statistical dynamical systems for skills acquisition in humanoids",
+ |			booktitle="Proc. {IEEE} Intl Conf. on Humanoid Robots ({H}umanoids)",
+ |			year="2012",
+ |			address="Osaka, Japan",
+ |			pages="323--329"
+ | 	     }
+ |
+ |
+*/