Markus Fulmek. A Combinatorial Proof for Cayley's Identity. Electr. J. Comb., 21(4):4, 2014. [doi]
@article{Fulmek14, title = {A Combinatorial Proof for Cayley's Identity}, author = {Markus Fulmek}, year = {2014}, url = {http://www.combinatorics.org/ojs/index.php/eljc/article/view/v21i4p40}, researchr = {https://researchr.org/publication/Fulmek14}, cites = {0}, citedby = {0}, journal = {Electr. J. Comb.}, volume = {21}, number = {4}, pages = {4}, }