@article{AIHPA_1971__14_1_1_0,
     author = {Speer, E. R. and Westwater, M. J.},
     title = {Generic {Feynman} amplitudes},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {1--55},
     publisher = {Gauthier-Villars},
     volume = {14},
     number = {1},
     year = {1971},
     mrnumber = {284095},
     zbl = {0208.27905},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1971__14_1_1_0/}
}