@article{1103842507,
author = {Common, A. K. and Yndurain, F. J.},
title = {Constraints on the derivatives of the $\pi \pi $ scattering amplitude from positivity},
journal = {Comm. Math. Phys.},
volume = {16},
number = {1},
year = {1970},
pages = { 171-178},
language = {en},
url = {http://dml.mathdoc.fr/item/1103842507}
}
Common, A. K.; Yndurain, F. J. Constraints on the derivatives of the $\pi \pi $ scattering amplitude from positivity. Comm. Math. Phys., Tome 16 (1970) no. 1, pp. 171-178. http://gdmltest.u-ga.fr/item/1103842507/