美国数学会网站：https://www.ams.org
Mathsicnet https://mathscinet.ams.org/mathscinet
Mathscinet Mirrors http://www.ams.org/errors/msn-mirrors.html
MSC(2010) https://mathscinet.ams.org/msc/msc2010.html
MR Lookup https://mathscinet.ams.org/mrlookup