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bulgariae » bulgarian, bulgarie, bulgarians
bulgaricae » bulgarica, bulgarische, bulgarian
vulgarian » bulgarian, bulgarians, vulgaridad
bulgariaica » bulgarica, bulgariia
bulgare » bulgarie, vulgare, bulgarien
bulger » bulge, bulges
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1
Published 2015
Springer International Publishing
“... Academy of Sciences, Sofia, Bulgaria  ...”
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2
Published 2016
Springer US
“... countries. The international List of Contributors, which includes authors from China, Bulgaria, Portugal...”