http://m.pnas.org/content/111/51/18183.full Warning PDF download: https://www.go...

  http://m.pnas.org/content/111/51/18183.full

  Warning PDF download: https://www.google.com/url?sa=t&source=web&rct=j&ei=daOsVOyDLYOkyAS724DQDQ&url=http://nlp.lsi.upc.edu/papers/poveda06.pdf&ved=0CB4QFjAA&usg=AFQjCNFcEw-sjwSO3yy9gBSIaEV-p1hxLw&sig2=7QbewnQq4QtnxsRHwE28xQ

  http://php.scripts.psu.edu/pul8/neuralnetworks.shtml

  http://www.ncbi.nlm.nih.gov/m/pubmed/18271736/

  Philosophical: http://en.m.wikipedia.org/wiki/Language_of_thought

EDIT sorry but I don't know how to insert a line break between URL's