Keller, Gottfried
Zurich : Atlantis Verlag AG, 1965
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Aue, Hartmann von
Berlin Walter de Gruyter 1958
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Horvath, Odon von, author
London Methuen Educational Ltd 1985
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Stuttgart : Philipp Reclam Jun, 1974
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Furstner, Hans
Groningen JB Wolters 1967
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