List of articles (by subject) Approximations and expansions Open Access Article Abstract Page Full-Text 1 - A generalization of Bertrand's test A. A. Tabatabai Adnani A. Reza M. Morovati 20.1001.1.22520201.2013.02.03.3.5 Open Access Article Abstract Page Full-Text 2 - Approximate solution of fourth order differential equation in Neumann problem J. Rashidinia D. Kalvand L. Tepoyan 20.1001.1.22520201.2013.02.04.5.9