http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Hướng dẫn giải bài tập toán rời rạc
Nội dung gồm: ngôn ngữ, đồ thị và logic. Mỗi chương được mở đầu bằng phần tóm tắt lý thuyết, bài tập giải mẫu và bài tập tự giải.