EXTERNAL COLLABORATIONS(for details, see the activity reports)
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INSTITUTIONS (Long term collaborations):

Early type stars : Conicet-Universitad de Cordoba (Ag); CNRS-Institut d'astrophysique Paris (IAP), CNRS-Observatoire de Marseille, INAF-Osservatorio di Catania

Interactive binaries : CNR-IASF, Conicet, ESA-VILSPA, IAP

Luminous Blue Variables : CNR-IASF, INAF-Osservatorio di Bologna, Sao Paulo University, NCPST-Dublin University

Late type stars : Byurakan Observatory, INAF-Osservatorio di Monteporzio.

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VISITING PROFESSORS (funds by 'La Sapienza' University) :

M.Villada 1984,1986,1997; M.Friedjung 1994, 1997 ; R.Gonzalez Riestra 1998, 2002, 2008; N.Spector 2000; A.Damineli 2001

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