Items where Author is "Costa, A. F."
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Costa, A. F. and Natanzon, S. M. (2003) Classification of Z^m_{p^2} \oplus Z^n_p actions on surfaces. MPIM Preprint Series 2003 (121).
Costa, A. F. and Natanzon, S. M. (2000) Topological classification of $Z^m_p$ actions on surfaces. MPIM Preprint Series 2000 (128).