http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Giáo trình sử dụng phần mềm toán học
Hoàng Trọng Thái, Trần Thị Ngọc Diệp, Lê Quang Phan, Nguyễn Văn Tuấn