CHARACTERISTICS OF VALLEYS ON CERAUNIUS THOLUS AND THEIR FORMATION: PART I. [online]. [Cit. 2007-09-05]. Dostupné online. Archivované 2020-06-03 z originálu.
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CHARACTERISTICS OF VALLEYS ON CERAUNIUS THOLUS AND THEIR FORMATION: PART I. [online]. [Cit. 2007-09-05]. Dostupné online. Archivované 2020-06-03 z originálu.