Some problems of the ethnogenesis of the Slavs and of the settlement process of the Central Danubian Slovenes-Slovaks in the 6th and 7th century - Chropovský, Bohuslav, 1926-2009 (Slovaks in the central Danubian region in the 6th to 11th century. Collection of papers from the conference held 30.11.-1.12.1999 in Nitra, Slovak Republic., 2000)