Melikadze, L. D., D. A. Shoniya, M. D. Kvinikadze, and I. P. Verba. 1975. O prodolzhitel'nosti deistviya preparata PLK v prirodnykh usloviyakh [Duration of the action of the preparation PLK in natural conditions] . Soobshcheniya Akademii Nauk Gruzinskoi SSR 79:709-712.