Variability of the H2O maser associated with the M-supergiant S PerseiE. E. Lekht, G. M. Rudnitskij, J. E. Mendoza-Torres and A. M. TolmachevA&A, 437 1 (2005) 127-133DOI: https://doi.org/10.1051/0004-6361:20052635
