[http://www.univ-rouen.fr/LMRS/Persopage/Fernandez/][1] [http://www.unige.ch/math/folks/velenik/][2] [http://www-old.math.gatech.edu/~jeanbel/][3] (quantum) [http://www.mat.ufmg.br/~aldo/research.html][4] (cluster expansion) [1]: http://www.univ-rouen.fr/LMRS/Persopage/Fernandez/ [2]: http://www.unige.ch/math/folks/velenik/ [3]: http://www-old.math.gatech.edu/~jeanbel/ [4]: http://www.mat.ufmg.br/~aldo/research.html