@article{Auberson_1975,
title={A tool for extending the analyticity domain of partial-wave amplitudes and the validity of roy-type equations},
volume={25},
ISSN={1826-9869},
url={http://dx.doi.org/10.1007/bf02820858},
DOI={10.1007/bf02820858},
number={3},
journal={Il Nuovo Cimento A},
publisher={Springer Science and Business Media LLC},
author={Auberson,
G. and Epele,
L.},
year={1975},
month=feb,
pages={453–466} }