"If I had been rich, I probably would not have devoted myself to mathematics."O'Connor, J. J.; Robertson, E. F., Joseph-Louis Lagrange, MacTutor, [2013-11-29], (原始内容存档于2012-10-22)
"If I had been rich, I probably would not have devoted myself to mathematics."O'Connor, J. J.; Robertson, E. F., Joseph-Louis Lagrange, MacTutor, [2013-11-29], (原始内容存档于2012-10-22)