Kostichkova, Dobrina R., Zdravko K. Belberov, Ekaterina Trifonova, and Diana Grudeva. Sea Level Surface Variations in Bourgas Bay In Proceedings of the Institute of Oceanology 3 . Varna: Bulgarian Academy of Sciences, 2001.

Belberov, Zdravko K., Dobrina R. Kostichkova, R.N. Maniarova, U.P. Poliakov, V.I. Zahariev, and U.M. Krilov. "Catastrophic Storm Analysis in February 1979." Oceanology 9 (1982).