MEASUREMENT OF DIFFERENTIAL CROSS-SECTIONS OF pi+ p AND pi- p ELASTIC SCATTERING IN THE REGION 425-MeV TO 640-MeV - Gordeev, V. A.; Koptev, V. P.; Kruglov, S. P.; Kuzmin, L. A.; Kulbardis, A. A.; Malov, Yu. A.; Mikirtychyants, S. M.; Strakovsky, I. I.; Shcherbakov, G. V. (Sov. J. Nucl. Phys., 1979)