Title: Contributions to theory of quantum spin models: 60th anniversary of Oleg Derzhko
Author(s):

	J. Strečka (Department of Theoretical Physics and Astrophysics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 040 01 Košice, Slovakia),
	T. Verkholyak (Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine, 1 Svientsitskii Street, 79011 Lviv, Ukraine)

Oleg Derzhko, the associated editor of "Condensed Matter Physics" journal, celebrated in August 2020 his 60th anniversary. Over the past few decades Oleg Derzhko has been scientifically working at the Institute for Condensed Matter Physics of National Academy of Sciences of Ukraine in Lviv. Oleg's scientific interests cover various modern problems of condensed matter physics and statistical physics. Oleg Derzhko has successfully developed a research direction, which is primarily focused on the state-of-the-art problems of quantum spin models with a particular emphasis on the exactly solvable models and is already recognized worldwide. In addition to this challenging research topic in its own right, Oleg has a lot of other scientific interests including, but not limited to, unsolved problems of phase transitions of atomic liquids. It is impossible to summarize here all Oleg's achievements, so let us briefly review at least a few most important milestones of his scientific career.

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