@article{SPS_2001__35__1_0, author = {Nagasawa, Masao and Tanaka, Hiroshi}, title = {The principle of variation for relativistic quantum particles}, journal = {S\'eminaire de probabilit\'es de Strasbourg}, pages = {1--27}, publisher = {Springer - Lecture Notes in Mathematics}, volume = {35}, year = {2001}, zbl = {0981.60100}, mrnumber = {1837274}, language = {en}, url = {http://www.numdam.org/item/SPS_2001__35__1_0/} }