Simultaneous H and photometric observations of P CygniN. Markova, S. Scuderi, M. de Groot, H. Markov and N. PanagiaA&A, 366 3 (2001) 935-944DOI: https://doi.org/10.1051/0004-6361:20000332
and photometric observations of P Cygni and photometric observations of P Cygni