@incollection {jue:99d,
 author = {J. Hoschek and B. J{\"u}ttler},
 title = {Techniques for fair and shape--preserving surface fitting with tensor--product {B}-splines},
 booktitle = {Shape Preserving Representations in Computer Aided Design (J.M. Pe\~na, ed.)},
 pages = {163--185},
 publisher = {Nova Science publishers},
 address = {New York, NY},
 year = {1999}
}