E. Blagoveshchenskiy, Y. Parashuk, Y. Obuchov, G. Malcev, and N. Ivashchenko, “PARACERVICAL ANAESTHESIA WITH SUBNARCOSES DOSES OF KETAMIN APPLICATION AT SMALL GYNECOLOGICAL OPERATIONS”, J. V. N. Karazin Khark. Nat. Univ., Ser. Med., no. 12, pp. 23-25, 1.