In search of RR Lyrae type stars in eclipsing binary systems - OGLE052218.07-692827.4: an optical blendA. Prša, E. F. Guinan, E. J. Devinney and S. G. EngleA&A, 489 3 (2008) 1209-1212DOI: https://doi.org/10.1051/0004-6361:200810486