P. Gruber, I. Aliev:
"Best simultaneous Diophantine Approximation under a constraint on the denominator";
Contributions to Discrete Mathematics, 1 (2006), S. 29 - 46.
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06587808
Projektleitung Peter M. Gruber:
Research on Geometry of Numbers and Convex Geometry