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MathSciNet bibliographic data
MR1122975 41A65 (41A25 46B20 49J45)
De Blasi, F. S.; Myjak, J.; Papini, P. L. Porous sets in best approximation theory. J. London Math. Soc. (2) 44 (1991), no. 1, 135–142.
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