http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
This book has been prepared to serve as a textbook for students taking a first course in differential equations , and as a reference book for those who have completed such a course. It is designed for studenhjts having a resonable working knowledge of algebra, trogonometry, and elementary calculus.
Differential equations,Phương trình vi phân