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[1] A. PULTR: An analogon of the fixed-point theorem and its applications. Comment. Math. Univ. Carolinae 4 (1963), 121-136. MR 0188104
[2] E. C. ZEEMAN O. P. BUNEMAN: Tolerance Spaces and the Brain, Towards a Theoretical Biology 1. edited by C. H. Waddingten, Edinburgh University Press 1968. MR 0300834
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