Seeds of Life in Space (SOLIS) - XI. First measurement of nitrogen fractionation in shocked clumps of the L1157 protostellar outflow
M. Benedettini, S. Viti, C. Codella, C. Ceccarelli, R. Neri, A. López-Sepulcre, E. Bianchi, G. Busquet, P. Caselli, F. Fontani, B. Lefloch, L. Podio, S. Spezzano and C. Vastel
