Early SPI/INTEGRAL measurements of 511 keV line emission from the 4th quadrant of the Galaxy
P. Jean, J. Knödlseder, V. Lonjou, M. Allain, J.-P. Roques, G. K. Skinner, B. J. Teegarden, G. Vedrenne, P. von Ballmoos, B. Cordier, P. Caraveo, R. Diehl, Ph. Durouchoux, P. Mandrou, J. Matteson, N. Gehrels, V. Schönfelder, A. W. Strong, P. Ubertini, G. Weidenspointner and C. Winkler
A&A, 407 3 (2003) L55-L58
DOI: https://doi.org/10.1051/0004-6361:20031056
