SCHAEFER, B. E., BARTHELMY, S. D., HUDEC, René, NOVÁK, Miroslav, BOROVIČKA, Jiří. Rapid searches for counterparts of GRB 930131. Astrophysical Journal. 1994, 422(2), Part 2, L71-L74. ISSN 0004-637X. E-ISSN 1538-4357.