21.    EkmanP., FriesenW.V. The repertoire of nonverbal behavior: categories, origins, usage and coding // Semiotica. 1969, v.1, p.49-98;

22.    EkmanP., FriesenW.V. Hand movement // J. Communication, 1972, v.22, p.353-374

23.    Francis H.W., Impact of coclear implants on the functional heralth status of older adults Laryngoscope 112 (8): 1482-8, August 2002

24.    Govaerts, Paul J., et al., Outcome of cochlear implantation at different ages from 0 to 6 years. Otology & Nuerotology 23(6) 885-90, November 2002.

25.    Hassanzandeh, Saeid, et al., The effects of age on auditory speech perception development in cochlear-implanted prelingually deaf children. Otolaryngology – Head & Neck Surgery. 126(5): 524-7, May 2002.

26.    Miyamoto, Richard and Kirk, Karen, Cochlear implants. In Bailey, Byron (ed). Head and Neck Surgery—Otolaryngology, third edition. Philadelphia, Lippincott-Raven, 2001, pp. 1949-1959.