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Gočev, Gočo - 1981

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Božilov, Jordan; Gočev, Gočo - 1983

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Tonev, Mladen - In: Izvestija : spisanie na Ikonomičeski Universitet, Varna (1999) 3, pp. 64-71

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Velev, Bojan - In: Ikonomičeska misăl 39 (1994) 8, pp. 22-38

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Vladimirovna, Katja Ivanova - In: Problemi na truda : teoretiko-priložno spisanie po … 38 (1997) 4, pp. 3-23

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Filipov, Dimităr - In: Ikonomičeska misăl 43 (1998) 6, pp. 3-17

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Vladimirovna, Katja Ivanova - In: Problemi na truda : teoretiko-priložno spisanie po … 38 (1997) 3, pp. 3-21

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Părvanova, Radka - 1985

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Bulgarien / Upravlenie na Obrazovanieto - Sofija - 29.1986 - 35.1992

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Nacionalen Statističeski Institut <Sofia> - Sofija - 1990(1991); 1991/92(1992) -

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