@misc{indiciaec7431008df1e,
  title = {Algorithms for test patterns in multiterminal devices with symmetry constraints.},
  author = {Happ, W. W. and Weitzenfeld, A. S.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690064535},
  note = {Source identifier: 19690064535}
}