@article{GDZPPN00242116X,
title = {Cubic Graphs and the First Eigenvalue of a Riemann Surface.},
journal = {Mathematische Zeitschrift},
volume = {162},
year = {1978},
pages = {87-100},
zbl = {0371.53032},
url = {http://dml.mathdoc.fr/item/GDZPPN00242116X}
}
Buser, Peter. Cubic Graphs and the First Eigenvalue of a Riemann Surface.. Mathematische Zeitschrift, Tome 162 (1978) pp. 87-100. http://gdmltest.u-ga.fr/item/GDZPPN00242116X/