1. http://arxiv.org/archive/math
2. http://www.imub.ub.es/collect/All.html
3. http://math.uh.edu/~hjm/Electronic-Editions.html
4. http://projecteuclid.org/DPubS?Service=UI&;
5. http://matwbn.icm.edu.pl./
6.http://www.hindawi.com/journals/fpta/contents.html


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