1. An Introduction to the Geometry of Numbers;Cassels,1971
2. Another NP-complete problem and the complexity of computing short vectors in a lattice;van Emde Boas,1981
3. An application of simultaneous approximation in combinatorial optimization;Frank,1985
4. Disquisitiones Arithmeticae;Gauss,1889
5. Polynomial time algorithms for finding integer relations among real numbers;Hastad,1985