Kra, I. (1972). Automorphic forms and Kleinian groups. W.A. Benjamin.
Lua i Stíl Chicago (17ú heag.)Kra, Irwin. Automorphic Forms and Kleinian Groups. Reading, Mass.: W.A. Benjamin, 1972.
Lua MLA (8ú heag.)Kra, Irwin. Automorphic Forms and Kleinian Groups. W.A. Benjamin, 1972.
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