Aspects of the topic Ostoih are discussed in the following places at Britannica.
Assorted References
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Montenegro (in Montenegro: The arts)
...by Pop (Father) Dukljanin of Bar. Thirty-eight years after Johannes Gutenberg’s invention (in 1494), the first state-owned printing press was established in Cetinje. In that year the Ostoih (“Book of Psalms”) was printed; it is believed to be the first book printed in Cyrillic from the South Slavic region. Without question the greatest poet of the region is...