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Kǔm uednakvjavane na dochodite v seloto i grada
Nončev, Ivan, (1975)
Minimum wage fixing machinery in agriculture
(1951)
Direktivy i stimuly v mekhanizme upravlenii︠a︡ ėkonomikoĭ
Doroshev, I. A., (1969)
When and where is a city fractal?
Benguigui, L., (1999)
An intensive programme in railway and logistics
Marinov, Marin, (2013)
Rail operations, management and economics
Marinov, Marin, (2015)