@article{1103859288, author = {K\"uhn, J. and Seiler, E.}, title = {Light cone expansion and four point function}, journal = {Comm. Math. Phys.}, volume = {29}, number = {1}, year = {1973}, pages = { 253-257}, language = {en}, url = {http://dml.mathdoc.fr/item/1103859288} }
Kühn, J.; Seiler, E. Light cone expansion and four point function. Comm. Math. Phys., Tome 29 (1973) no. 1, pp. 253-257. http://gdmltest.u-ga.fr/item/1103859288/