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- [2] COMMEMORATIVE ISSUE OF THE 50TH ANNIVERSARY OF SAO-PAULO-UNIVERSITY - INTRODUCTION REVISTA DE SAUDE PUBLICA, 1984, 18 : 1 - 1
- [4] 25th September 1997: 50th anniversary of Polysius Limited in Ascot ZKG INTERNATIONAL, 1997, 50 (11): : A2 - A2
- [6] 25TH ANNIVERSARY OF UNIVERSITY-OF-MIAMI-SCHOOL OF MEDICINE JOURNAL OF THE FLORIDA MEDICAL ASSOCIATION, 1977, 64 (02): : 73 - 74