Photometric and Spectrophotometric Observations of the Classical Symbiotic Star YY Her during Its Return to Quiescence Tatarnikova, A. A. ; Esipov, V. F. ; Kolotilov, E. A. ; Mikolajewska, J. ; Munari, U. ; Shugarov, S. Yu. Abstract Publication: Astronomy Letters Pub Date: November 2001 DOI: 10.1134/1.1415859 Bibcode: 2001AstL...27..703T