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- Some open problems in random matrix theory and the theory of integrable systems, Percy Deift. We describe a list of open problems in random matrix theory and integrable systems which was presented at the conference ``Integrable Systems, Random Matrices, and Applications'' at the Courant Institute in May 2006. arXiv.org.
- Problemas abiertos en series de Fourier de Jacobi-Sobolev, Francisco Marcellán, Boris P. Osilenker and Ignacio A. Rocha. In this paper we dealw ith several problems concerning estimates of polynomials orthogonal with respect to Sobolev inner products. These problems have beenmotivated by some previouswork by J. J. Guadalupe et al. when the standard orthogonality using measures with mass points is considered in the study of Fourier expansions in terms of orthogonal polynomials. [in Spanish].

- Unsolved Problems. From Wolfram MathWorld: The Web's Most Extensive Mathematics Resource.
Unsolved problems in mathematics. From Wikipedia, the free encyclopedia.

- Mathematical Problems. In various subjects, compiled by Torsten Sillke.