http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Nguyễn Đình Trí, Nguyễn Hồ Quỳnh, Tạ Văn Đĩnh
Algebras and applications,Geometry, Analytic
Probems, exercises, ect,Problems, exercises, etc