@article{1103841120,
author = {Zimmerman, Wolfhart},
title = {Direction-dependent singularities for $A^{4}$-coupling},
journal = {Comm. Math. Phys.},
volume = {7},
number = {1},
year = {1968},
pages = { 325-329},
language = {en},
url = {http://dml.mathdoc.fr/item/1103841120}
}
Zimmerman, Wolfhart. Direction-dependent singularities for $A^{4}$-coupling. Comm. Math. Phys., Tome 7 (1968) no. 1, pp. 325-329. http://gdmltest.u-ga.fr/item/1103841120/