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by Ruzer; Lev S.
by Berkovich, Yakov G.; Kazarin, Lev S.; Zhmud', Emmanuel M.
by Munsky, Brian; Hlavacek, William S.; Tsimring, Lev S.
by Gonick, Lev S.; Weisband, Edward
by Adams, John Joseph; Gaiman, Neil; Grossman, Lev; et al.
by Vigotsky, Lev S.; Montoto, Maxim
by Ruzer, Lev S.; Harley, Naomi H.
by Tolstói, Lev; Fernández-Valdés Roig-Gironella, Joaquín