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Moscow Independent University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 28, No. 3, pp. 35–46, July–September, 1994.
The research described in this publication was made possible in part by Grant No. MD8000 from the International Science Foundation.
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Natanzon, S.M. Classification of pairs of Arf functions on orientable and nonorientable surfaces. Funct Anal Its Appl 28, 178–186 (1994). https://doi.org/10.1007/BF01078451
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DOI: https://doi.org/10.1007/BF01078451