Merge pull request #6490 from nouiz/more_citation

doc/acknowledgement.txt

@@ -24,4 +24,4 @@ Acknowledgements
     P. L'Ecuyer and R. Touzin, `Fast Combined Multiple Recursive Generators with Multipliers of the form a = +/- 2^d +/- 2^e <http://www.informs-sim.org/wsc00papers/090.PDF>`_, Proceedings of the 2000 Winter Simulation Conference, Dec. 2000, 683--689.
 
   We were authorized by Pierre L'Ecuyer to copy/modify his Java implementation in the `SSJ <http://www.iro.umontreal.ca/~simardr/ssj/>`_ software and to relicense it under BSD 3-Clauses in Theano.
-* A better GPU memory allocator :attr:`CNMeM <config.lib.cnmem>` is included in Theano. It has the same license.
+* A better GPU memory allocator :attr:`CNMeM <config.lib.cnmem>` was included in Theano in the previous GPU back-end. It is still in the history, but not in the current version. It has the same license.

theano/sandbox/rng_mrg.py

@@ -4,6 +4,13 @@ Implementation of MRG31k3p random number generator for Theano.
 Generator code in SSJ package (L'Ecuyer & Simard).
 http://www.iro.umontreal.ca/~simardr/ssj/indexe.html
 
+The MRG31k3p algorithm was published in:
+
+P. L'Ecuyer and R. Touzin, Fast Combined Multiple Recursive Generators with Multipliers of the form a = +/- 2^d +/- 2^e, Proceedings of the 2000 Winter Simulation Conference, Dec. 2000, 683-689.
+
+The conception of the multi-stream from MRG31k3p was published in:
+
+P. L'Ecuyer and R. Simard and E. Jack Chen and W. David Kelton, An Object-Oriented Random-Number Package with Many Long Streams and Substreams, Operations Research, volume 50, number 6, 2002, 1073-1075.
 """
 from __future__ import absolute_import, print_function, division
 import warnings