http://www.twjm.org/
https://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/ccd=VCY6Vb/login?jstimes=1&loadingjs=1&o=dwebmge&ssoauth=1&cache=1536819564264
https://mjl.clarivate.com/home
https://zbmath.org/
https://mathscinet.ams.org/mathscinet/
https://arxiv.org/