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- [1] 20TH LINGUISTIC COLLOQUIUM IN WOLFENBUTTEL SEPTEMBER 17-20, 1985 ZEITSCHRIFT FUR SEMIOTIK, 1986, 8 (1-2): : 163 - 164
- [2] PROCEEDINGS OF THE 20TH CONGRESS OF THE SCANDINAVIAN-ASSOCIATION-OF-UROLOGY - MAY 17-20, 1995, LUND, SWEDEN - PREFACE SCANDINAVIAN JOURNAL OF UROLOGY AND NEPHROLOGY, 1995, : 3 - 3
- [5] Results of the SIFES survey: 20th National SIFES and MR Congress - Rimini, December 17-20, 2000 TWENTIETH NATIONAL CONGRESS OF THE ITALIAN SOCIETY FOR FERTILITY AND STERILITY AND REPRODUCTIVE MEDICINE, 2000, : 349 - 351
- [9] 20TH CIE CONGRESS, AMSTERDAM, SEPTEMBER 1983 COLOR RESEARCH AND APPLICATION, 1984, 9 (03): : 179 - 182