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Frolík, Z. (ed.): Proceedings of the 12th Winter School on Abstract Analysis.
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Circolo Matematico di Palermo, Palermo, 1984.
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Čerin, Zvonko: On medial properties of maps.
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In:
Frolík, Zdeněk (ed.): Proceedings of the 10th Winter School on Abstract Analysis.
Circolo Matematico di Palermo, Palermo, 1982.
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