@inproceedings{bridges2020:395,
  author      = {Spector, Donald},
  title       = {Visualizing (Number Theoretic) Functions with Portraits},
  pages       = {395--398},
  booktitle   = {Proceedings of Bridges 2020: Mathematics, Art, Music, Architecture, Education, Culture},
  year        = {2020},
  editor      = {Yackel, Carolyn and Bosch, Robert and Torrence, Eve and Fenyvesi, Krist\'{o}f},
  isbn        = {978-1-938664-36-6},
  issn        = {1099-6702},
  publisher   = {Tessellations Publishing},
  address     = {Phoenix, Arizona},

  url         = {http://archive.bridgesmathart.org/2020/bridges2020-395.html}
}