On spectral variability of beta CEP type stars gamma Peg and 12 Lac. Tarasov, A. E. ; Garbusov, G. A. Abstract Publication: Izvestiya Ordena Trudovogo Krasnogo Znameni Krymskoj Astrofizicheskoj Observatorii Pub Date: 1992 Bibcode: 1992IzKry..85...50T