Digital Curves in 3D Space and a Linear-Time Length Estimation Algorithm
@TechReport{buelow99citr,
  author = {T. B{"u}low and R. Klette},
  title = {Digital Curves in 3D Space and a Linear-Time Length Estimation Algorithm},
  institution = {Computer-Science Department of The University of Auckland, CITR at Tamaki Campus},
  type = {Technical Report},
  number = {Number 55},
  month =      {December},
  year = 1999,
  url = {http://www.tcs.auckland.ac.nz/research/techreports/1999/CITR-TR-55.html}
}