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W. J. Charatonik, “Some Counterexamples Concerning Whitney Levels,” Bull. Polish. Acad. Sci. Math., Vol. 31, 1983, pp. 385-391.

has been cited by the following article:

• TITLE: Making Holes in the Hyperspace of Subcontinua of Some Continua

  AUTHORS: José G. Anaya, Enrique Castañeda-Alvarado, Fernando Orozco-Zitli

  KEYWORDS: Continuum; Elsa Continuum; Fan; Hyperspace; Property b); Unicoherence; Whitney Map

  JOURNAL NAME: Advances in Pure Mathematics, Vol.2 No.2, March 22, 2012

  ABSTRACT: Let be a metric continuum. Let , is said to make a hole in , if is not unico-herent. In this paper, we characterize elements such that makes a hole in , where is either a smooth fan or an Elsa continuum.