1. On the quantum Feynman-Kac formula;Accardi;Rend. Mat. Fis. Milano,1978
2. The theory of positrons. Space-time approach to electro-dynamics;Feynman;Phys. Rev.,1949
3. The theory of positrons. Space-time approach to electro-dynamics;Feynman;Phys. Rev.,1949
4. Total positivity and the embedding problem for Markov chains;Frydman,1979
5. Sur les matrices oscillatoires et complètement non négatives;Gantmacher;Compositio Math.,1937