@PHDTHESIS{tring2013, url = "http://www.theses.fr/2013STET4021", title = "Some questions in combinatorial and elementary number theory", author = "Tringali, Salvatore", year = "2013", note = "Thèse de doctorat dirigée par Hennecart, François et Plagne, Alain Mathématiques pures Saint-Etienne 2013", note = "2013STET4021", url = "http://www.theses.fr/2013STET4021/document", }