Here, there are methods to collect articles.

Arts and sciences search

MathSciMet  AMS Ref.(free)
Zentralblatt MATH  Google Scholar
Amazon

Online articles

scienceDirect     interScience
splingerLink     Project Euclid
CiNii

E-journal

scienceDirect
An information source for scientific, technical, and medical research. Subscription required for some sections (Elsevier's full-text platform).
interScience
Online editions of the majority of Wiley's 400+ scientific, technical, medical and professional journals (Wiley).
springerLink
SpringerLink is interactive databases for high-quality STM journals, book series, books, reference works (Springer).
Click [Japanese] in the top of this page if you want search Japanese site. If you know the site of mathematical resources with free charge, please send me e-mail.

Project Euclid

mathematics and statistics resources online
Installation of (MathML) sake MathPlayer letting you display a numerical formula is necessary.

Hiroshima Mathematical Journal(2001〜),    Japan Journal pf Industrial and Applied Mathematics (2006〜),     The Journal of the Mathematical Society of Japan (2002〜)     The Nagoya Mathematical Journal (1950〜),     The Osaka Journal of Mathematics (2001〜),     Proceedings of the Japan Academy, Series A (1912〜),     Tohoku Mathematical Journal (1945〜),     Tokyo Journal of Mathematics (2006〜)