Charles Jean Gustave Nicolas Baron de la Vallée Poussin
(1866-1962)
- de la Vallée Poussin, Ch. J., Collected Works, Volume 3
concerns approximation theory,
Fourier Analysis and quasi-analytic functions.
- Burkill, J. C., Charles-Joseph de la Vallée Poussin, J. London
Math. Soc. 39 (1964), 165-175.
- Butzer, P. L., and R. J. Nessel, Aspects of de la Vallée Poussin's
work in approximation and its influence, Archive Hist. Exact
Sciences 46 (1993), 67-95.