[Indices characterizing sampling of twins in the city of Erevan].
D001136:Armenia; D001723:Birth Rate; D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy; D012744:Sex Ratio; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic; D014505:Urban Population
O nekotorykh pokazateliakh, kharakterizuiushchikh bliznetsovuiu vyborku g. Erevana.