I. M. Sheffer

Note on Appell polynomials

I. M. Sheffer, I. Sheffer, 1945 .

A differential equation for Appell polynomials

I. M. Sheffer, I. Sheffer, 1935 .

Some properties of polynomial sets of type zero

I. M. Sheffer, I. Sheffer, 1939 .

Differential equations of infinite order for orthogonal polynomials

H. L. Krall, I. M. Sheffer, H. Krall, 1966 .

Review: Morris Marden, The geometry of the zeros of a polynomial in a complex variable

I. M. Sheffer, I. Sheffer, 1950 .

Orthogonal polynomials in two variables

H. L. Krall, I. M. Sheffer, 1967 .