@incollection {jue:95c,
 author = {B. J{\"u}ttler},
 title = {Spatial rational motions and their application in Computer Aided Geometric Design},
 booktitle = {Mathematical Methods for Curves and Surfaces (M. D\ae hlen et al., eds.)},
 pages = {271--280},
 publisher = {Vanderbilt University Press},
 address = {Nashville, TN},
 year = {1995}
}