Perhaps you should try some spelling variations:
"lesehefte zu poetica" » "leseheft zur poetica", "geschafte zu poetica", "beihefte zu poetica", "lesehefte la poetica", "lesehefte de poetica", "lesehefte e poetica"
"leithefte zu poetica" » "leithefte la poetica", "leithefte de poetica", "leithefte e poetica", "beihefte zu poetica", "testhefte zu poetica"

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