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4. V. I. Babii, “Problems and perspectives of sound velocity measurements in the ocean”, in Contemporary Problems of Oceanology, No. 7 (NPTs “EKOSI Gidrofizika”, Sevastopol, 2009) [in Russian].
5. V. I. Babii and A. P. Tolstosheev, Work Means for Sound Velocity Measurement in the Ocean (Mor. Gidrofiz. Inst. Nat. Akad. Nauk Ukrainy, Sevastopol, 1999) [in Russian].