On Pólya frequence functions. III. The positivity of translation determinants with an application to the interpolation problem by spline curves

I. J. Schoenberg, Anne Whitney
1953 Transactions of the American Mathematical Society  
doi:10.1090/s0002-9947-1953-0053177-x fatcat:vbmbj7vhkveuboe5yalr4iddjm