PRECISE MEASUREMENT OF THE PION CHARGE EXCHANGE FORWARD DIFFERENTIAL CROSS-SECTION AT 522-MEV/C - Gaille, F. C.; Highland, V. L.; Auerbach, L. B.; Mcfarlane, W. K.; Hogan, G. E.; Hoffman, C. M.; Macek, R. J.; Morgado, R. E.; Pratt, J. C.; Werbeck, R. D. (Phys. Rev. D, 1984)