Kovalyova, M. A. & Vyalova, O. Yu. 2021, "The first record of rock-boring mollusc Petricola lithophaga (Retzius, 1788) inside the valves of oysters Crassostrea gigas (Thunberg, 1793), cultivated in Crimea (the Donuzlav Bay, the Black Sea)", Marine Biological Journal, vol. 6, no. 1, pp. 34-40. doi: 10.21072/mbj.2021.06.1.03