Perhaps you should try some spelling variations:
"functions of a komplexe variable" » "functions of a komplexen variablen", "functions of a complex variable", "functions of a complex variables", "functions of a5 komplexe variable", "functions of 3 komplexe variable", "functions of 1 komplexe variable"
"functions of 5 komplexe variable" » "functions of 5 komplexen variablen", "functions of 5 complex variable", "functions of 5 complex variables", "functions of 3 komplexe variable"

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