Statistics

Head, Nikolai Alekseevich (1849-1919).Statistics: (theory and methods of statistics. Highlights in the history of its development. Bron. Sketch of population statistics) / N.A.Heel, prof.Mosk.un-ta.- 4th ed., Ched.-Moscow, 1918. -XII, 319, [2] p.;24. -.Electronic Source: PB