See Harary & Sumner (1980). Harary, Frank; Sumner, David (1980), "The dichromatic number of an oriented tree", Journal of Combinatorics, Information & System Sciences, 5 (3): 184–187, MR0603363.
Kozlov, Dmitry N. (1999). "Complexes of directed trees". Journal of Combinatorial Theory. Series A. 88 (1): 112–122. doi:10.1006/jcta.1999.2984. MR1713484.
DeBiasio, Louis; Lo, Allan (2019-10-09). "Spanning trees with few branch vertices". arXiv:1709.04937 [math.CO].
Tran, Ngoc Mai; Buck, Johannes; Klüppelberg, Claudia (February 2024), "Estimating a directed tree for extremes", Journal of the Royal Statistical Society Series B: Statistical Methodology, 86 (3): 771–792, arXiv:2102.06197, doi:10.1093/jrsssb/qkad165
Cayley (1857) "On the theory of the analytical forms called trees,"Philosophical Magazine, 4th series, 13: 172–176. However it should be mentioned that in 1847, K.G.C. von Staudt, in his book Geometrie der Lage (Nürnberg, (Germany): Bauer und Raspe, 1847), presented a proof of Euler's polyhedron theorem which relies on trees on pages 20–21. Also in 1847, the German physicist Gustav Kirchhoff investigated electrical circuits and found a relation between the number (n) of wires/resistors (branches), the number (m) of junctions (vertices), and the number (μ) of loops (faces) in the circuit. He proved the relation via an argument relying on trees. See: Kirchhoff, G. R. (1847) "Ueber die Auflösung der Gleichungen, auf welche man bei der Untersuchung der linearen Vertheilung galvanischer Ströme geführt wird"Archived 2023-07-20 at the Wayback Machine (On the solution of equations to which one is led by the investigation of the linear distribution of galvanic currents), Annalen der Physik und Chemie, 72 (12): 497–508.
Kozlov, Dmitry N. (1999). "Complexes of directed trees". Journal of Combinatorial Theory. Series A. 88 (1): 112–122. doi:10.1006/jcta.1999.2984. MR1713484.
Tran, Ngoc Mai; Buck, Johannes; Klüppelberg, Claudia (February 2024), "Estimating a directed tree for extremes", Journal of the Royal Statistical Society Series B: Statistical Methodology, 86 (3): 771–792, arXiv:2102.06197, doi:10.1093/jrsssb/qkad165
Cormen, Thomas H.; Leiserson, Charles E.; Rivest, Ronald L.; Stein, Clifford (2022). Introduction to Algorithms (4thed.). Section B.5.3, Binary and positional trees: MIT Press. p.1174. ISBN9780262046305. Archived from the original on 16 July 2023. Retrieved 20 July 2023.{{cite book}}: CS1 maint: location (link)
See Black, Paul E. (4 May 2007). "k-ary tree". U.S. National Institute of Standards and Technology. Archived from the original on 8 February 2015. Retrieved 8 February 2015.
Cayley (1857) "On the theory of the analytical forms called trees,"Philosophical Magazine, 4th series, 13: 172–176. However it should be mentioned that in 1847, K.G.C. von Staudt, in his book Geometrie der Lage (Nürnberg, (Germany): Bauer und Raspe, 1847), presented a proof of Euler's polyhedron theorem which relies on trees on pages 20–21. Also in 1847, the German physicist Gustav Kirchhoff investigated electrical circuits and found a relation between the number (n) of wires/resistors (branches), the number (m) of junctions (vertices), and the number (μ) of loops (faces) in the circuit. He proved the relation via an argument relying on trees. See: Kirchhoff, G. R. (1847) "Ueber die Auflösung der Gleichungen, auf welche man bei der Untersuchung der linearen Vertheilung galvanischer Ströme geführt wird"Archived 2023-07-20 at the Wayback Machine (On the solution of equations to which one is led by the investigation of the linear distribution of galvanic currents), Annalen der Physik und Chemie, 72 (12): 497–508.
See Black, Paul E. (4 May 2007). "k-ary tree". U.S. National Institute of Standards and Technology. Archived from the original on 8 February 2015. Retrieved 8 February 2015.
Cormen, Thomas H.; Leiserson, Charles E.; Rivest, Ronald L.; Stein, Clifford (2022). Introduction to Algorithms (4thed.). Section B.5.3, Binary and positional trees: MIT Press. p.1174. ISBN9780262046305. Archived from the original on 16 July 2023. Retrieved 20 July 2023.{{cite book}}: CS1 maint: location (link)
