1. É. Sh. Airapet'yants and A. I. Konstantinov, Echolocation in Nature [in Russian], Nauka, Leningrad (1974), 512 pp.
2. A. G. Vasil'ev, "Characteristics of electrical responses of the inferior colliculi of the Vespertilionidae and Rhinolophidae during a change in intensity of ultrasound," in: Mechanisms of Nervous Activity [in Russian], Leningrad (1969), pp. 180?187.
3. A. G. Vasil'ev, "Unit responses of the superior olives in bats to single and paired ultrasonic stimuli," Neirofiziologiya,8, 30 (1976).
4. A. G. Vasil'ev and T. I. Grigor'eva, "Single unit responses to ultrasonic stimuli in the cochlear nuclei of bats," Neirofiziologiya,9, 41 (1977).
5. V. I. Malashin, "Theoretical and experimental investigations of frequency-modulated stimuli reflected from objects identifiable by bats," Abstracts of Proceedings of the 23rd Scientific and Technical Conference of the Leningrad Institute of Aviation Instruments, February 3?5, 1970 [in Russian], Leningrad (1970), p. 57.