@article{GDZPPN002191393,
title = {The number of archiral trees.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {272},
year = {1975},
pages = {322-335},
zbl = {0311.05102},
url = {http://dml.mathdoc.fr/item/GDZPPN002191393}
}
Harary, Frank; Robinson, Robert W. The number of archiral trees.. Journal für die reine und angewandte Mathematik, Tome 272 (1975) pp. 322-335. http://gdmltest.u-ga.fr/item/GDZPPN002191393/