3 books • 2 series
Waterbirds of Bourgas Wetlands (Pensoft Series Faunistica, #44)
Waterbirds of Bourgas Wetlands: Results and Evaluation of the Monthly Waterbird Monitoring 1996-2002 (Pensoft Series Faunistica, Bourgas Wetlands Publication)
Mid-winter Numbers of Waterbirds in Bulgaria (1977-2001)