1. Ando, T., Totally positive matrices, Lin. Alg. and Appl.
90 (1987), 165– 219.
2. Anselone, P. M., and J. W. Lee, Spectral properties of integral operators with nonnegative kernels, Lin. Alg. and Appl.
9 (1974), 67–87.
3. Birkhoff, G. D., In Memoriam: The Mathematical work of Oliver Dimon Kellogg, Bull. Amer. Math. Soc.
39 (1933), 171–177.
4. Buslaev, A. P., Extremal problems of approximation theory, and nonlinear oscillations, Dokl. Akad. Nauk SSSR
305 (1989), 1289–1294;
5. Buslaev, A. P., English transl. in Soviet Math. Dokl.
39 (1989), 379–384.