ed. by Badri N. Sahney and R. J. Knops.NATO Advanced Study Institute on Polynomial and Spline Approximation(1978 : Calgary, Canada);Polynomial and spline approximation：theory and applications.Reidel,1979.
NATO Advanced Study Institute on Polynomial and Spline Approximation(1978 : Calgary, Canada);Polynomial and spline approximation：theory and applications
ed. by Badri N. Sahney and R. J. Knops.Reidel,1979.
