@article{GDZPPN002438070, title = {Small eigenvalues of Riemann surfaces and graphs.}, journal = {Mathematische Zeitschrift}, volume = {205}, year = {1990}, pages = {395-420}, zbl = {0729.58050}, url = {http://dml.mathdoc.fr/item/GDZPPN002438070} }
Burger, Marc. Small eigenvalues of Riemann surfaces and graphs.. Mathematische Zeitschrift, Tome 205 (1990) pp. 395-420. http://gdmltest.u-ga.fr/item/GDZPPN002438070/