http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Tích phân phụ thuộc tham số. Tích phân bội. Tích phân đường và tích phân mặt
Trần Đức Long, Nguyễn Đình Sang, Hoàng Quốc Toàn