Harder, Theodor.
Introduction to mathematical models in market and opinion research with practical procedures, and estimates of computing requirements / Theodor Harder. - Holland: D. Reidel Publishing, 1969. - ix, 194 p.
Market research--Mathematical models.
Introduction to mathematical models in market and opinion research with practical procedures, and estimates of computing requirements / Theodor Harder. - Holland: D. Reidel Publishing, 1969. - ix, 194 p.
Market research--Mathematical models.