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by Ermakov, Sergey; Beletskii, Alexandr; Eismont, Oleg; et al.
by Ermakov, Sergey F.; Myshkin, Nikolai K.
by Sergey Ermakov; Alexandr Beletskii; Oleg Eismont; et al.
by Sergey F. Ermakov; Nikolai K. Myshkin
by Ermakov, Sergey; Nekrutkin, V. V.; Sipin, A. S.
by Sergey Ermakov; Viatcheslav B. Melas; N. Balakrishnan