https://blackmeditjournal.org/volumes-archive/vol18-2012/vol-18-2012-no-3/caspian-seal-phoca-caspica-gmelin-1788-and-its-current-status-in-the-caspian-sea/
CASPIAN SEAL (PHOCA CASPICA GMELIN, 1788) AND ITS CURRENT STATUS IN THE CASPIAN SEA – Journal of...
in the seacaspian sealphoca caspicacurrent statusgmelin