Ta eis tēn marmarikēn technēn chrēsima petrōmata tēs Hellados - Papageōrgakēs, Iōannēs E. (I.E. Papageōrgakēs, 1967)
"Diatrivē epi hyphēgesia."
"Anatypon ek tōn 'Geōlogikōn chronikōn tōn Hellēnikōn chorōn.'"