Катедра "Социално-икономическа география" - Trends and specifics in the reproductive behaviour of the bulgarian population at the beginning of the 21-st century

Toni TRAYKOV and Kaloyan TSVETKOV: Trends and specifics in the reproductive behaviour of the bulgarian population at the beginning of the 21-st century

Kaloyan Tsvetkov on ResearchGate

Kaloyan Tsvetkov on GoogleScholar