Sugerencias
Quizá quiso decir:
International Astronomical Union
International Astronomical Union. Symposium 145th : 1990 Zlatni Pjasaci (golden Sands), Bulgaria
International Astronomical Union Symposium 147th : 1990 : Grenoble, France
International Astronomical Union. Symposium 153rd : 1992 : Ghent, Belgium
International Astronomical Union. Proceeding (130th : 1987 : Balatonfured, Hungary)
International Astronomical Union. Symposium ( No.94 : 1980, Bologna, Italy)
International astronomical Union. Proceedings (113 th : 1984, Princeton, New Yersey, U.S.A.)
International Astronomical Union. Symposium (190th : 1998 : Victoria, B. C.)
International Astronomical Union. Symposium (192nd : 1998 : Cape Town, South Africa)
International Astronomical Union. Symposium (150th : 1991 : Campos do Jordao, Sao Paulo, Brazil)
International Astronomical Union. Symposium (195th : 1999 : Bozeman, Montana, U.S.A.)
International Astronomical Union. Symposium ( 149th : Angra dos Reis, Brazil)
International Astronomical Union. Symposium ( 144th : 1990 : Leiden, Netherlands)
International Astronomical Union. Symposium ( 193th : 1998 : Puerto Vallarta, Mexico)