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

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("functions of a complex variable") OR ((("functions of a complete variable") OR ("functions of a komplexe variable")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"functions of a complex variable\") or (((\"functions of a complete variable\") OR (\"functions of a komplexe variable\"))))".
• Removing quotes may allow a broader search: (( functions of a complex variable ) or ((( functions of a complete variable ) OR ( functions of a komplexe variable )))).
• Adding a wildcard symbol may retrieve word variants: (("functions of a complex variable") or ((("functions of a complete variable") OR ("functions of a komplexe variable"))))*.