Prof. Benjamin Grinstein, (S Diego, California) (1990)
Prof. A. Yu. Smirnov, SAB-91-XXX (Trieste/ICTP) (1991)
Prof. Venya Berezinsky, (Gran Sasso) (1993)
Prof. V. A. Kuzmin, SAB-92-0262 (INR, Moscow) (1993/1994)
Prof. E. Akhmedov, SAB-93-0090 (Trieste/SISSA) (1993/1994)
Dr. V. Semikoz, NATO scientist (Izmiran, Troitsk, Moscow) (1993/1994)
Dr. A. Ioannissian (Max-Planck, Munich) (1994 y 1995)
Prof. A. Joshipura,SAB-94-0014 (Ahmelabad) (1994)
Prof. M. Vysotsky, (ITEP, Moscow) (1994)
Prof. O. Eboli (S. Paulo, Brasil) (1994)
Prof. S. Novaes (UNESP, S. Paulo, Brasil) (1995)
Prof. A. Dolgov, SAB-94-0089 (Copenhagen) (1994/1995)
Dr. V. Semikoz, SAB-94-0325 (Izmiran, Troitsk, Moscow) (1995)
Prof. O. Eboli (S. Paulo, Brasil) (1996)
Prof. S. Rindani, SAB-95-0175 (Ahmelabad) (1995/96)
Dr. V. Semikoz, SAB-95-0506 (Izmiran, Troitsk, Moscow) (1997)
Prof. A. Joshipura, SAB-95-0627 (Ahmelabad) (1997)
Prof. O. Eboli, (S. Paulo, Brasil) (1998)
Prof. A. Yu. Smirnov, (Trieste/ICTP) (1998)
Dr. A. Rez, (Izmiran, Troitsk, Moscow) (2000)
 
 

Dr. L. Bento (Lisboa) , (90/91) portuguese fellowship
Dr. Peltoniemi (Helsinki) ,(91/93) DGICYT
Dr. D. Tommasini (Trieste) , (91/94) DGICYT
Dr. J. Rosiek (Varsovia/Karlsruhe), (94/96) DGICYT
Dr. S. Ranfone (Pisa), (94/96) EC contract ERBCHBI CT930726
Dr. A. Rossi (Ferrara), (94/96) EC contract ERBCHBI CT941592
Dr. O. Peres (Brazil), (96/98) CNPq fellowship
Dr. H. Nunokawa (Japon), (94/97) DGICYT, mod. B
Dr. O. Miranda (Mejico), (96/98) Mejican fellowship
Dr. Michael Kachelriess, (CERN) (98/99) EC contract ERBFMBI-CT98-2966
Dr. A. Akeroyd (Durham), (96/98) CSIC/UK Royal Society
Dr. M. A. Diaz (Chile/UK),(97/99) DGICYT, mod. B
Dr. D. Grasso (Rome), (98) EU fellowship
Dr. W. Porod (Vienna), EU fellowship
Dr. Nicolao Fornengo (Universidad di Torino) (98/99), EU fellowship
Dr. H. Paes (MPI Heidelberg), (2000) EU fellowship
Dr. M. Hirsch   (MPI Heidelberg), (98/00) EC contract ERBFMBI-CT98-3000