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- [3] 4TH INTERNATIONAL-CONGRESS ON STEREOLOGY JOURNAL OF SCIENTIFIC & INDUSTRIAL RESEARCH, 1977, 36 (03): : 106 - 112
- [5] 4TH INTERNATIONAL-CONGRESS FOR REPROGRAPHY NACHRICHTEN FUR DOKUMENTATION, 1975, 26 (03): : 118 - 118
- [6] AMERICAN CONTRIBUTIONS TO THE 4TH INTERNATIONAL-CONGRESS OF SLAVICISTS, MOSCOW, SEPTEMBER 1958 SLAVIC AND EAST EUROPEAN JOURNAL, 1959, 3 (02): : 177 - 179
- [8] 4TH INTERNATIONAL-CONGRESS OF THE IMMUNOLOGISTS IN PARIS, JUNE 21 TO 26, 1980 ZDRAVSTVENI VESTNIK, 1980, 49 (11): : 608 - 610
- [9] THE PROBLEM OF WRITTEN SLAVIC LANGUAGES AT THE 10TH INTERNATIONAL-CONGRESS OF SLAVISTS IN SOFIA ZEITSCHRIFT FUR SLAWISTIK, 1989, 34 (04): : 590 - 591
- [10] 4TH NATIONAL CONGRESS OF OBSTETRICIANS AND GYNECOLOGISTS IN BULGARIA, JUNE 6-8, 1980, SOFIA ZENTRALBLATT FUR GYNAKOLOGIE, 1980, 102 (24): : 1458 - 1458