1.

Book

Book
редакционная коллегия, П. Симова, И. Саватинова, Л. Цонев
Published: София : Изд-во Болгарской АН, 1982
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2.

Book

Book
[edited by I. J. Lalov]
Published: Sofia : Pub. House of the Bulgarian Academy of Sciences, 1981
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