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Sezonnostta v bălgarskija turizăm
Vasileva, Vanja - 2012 - 1. izd.
Persistent link: https://www.econbiz.de/10009719351
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Sezonni li sa tărseneto i predlaganeto na trud
Zarkova, Marija - In: Problemi na truda : teoretiko-priložno spisanie po … 37 (1996) 8, pp. 63-74
Persistent link: https://www.econbiz.de/10001215733
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Statističeski vremevi redove na vănšnotărgovskija stokoobmen na Bălgarija, 1986 - 2006 g.
Tasev, Aleksandăr Petrov - 2011
Persistent link: https://www.econbiz.de/10009517899