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Naselenie (Sofia, Bulgaria : 1983)|January 1, 1987
[Probability evaluation of yearly infant mortality]E KhristovNaselenie (Sofia, Bulgaria : 1983)|January 1, 1990
[Probabilities of death by calendar year with consideration of the migratory balance]E KhristovNaselenie (Sofia, Bulgaria : 1983)|January 1, 1992
[Disaggregation of age coefficients by region]E KhristovPageof 1