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@article{MZ_1978__162_172717, author = {Peter Buser}, title = {Cubic {Graphs} and the {First} {Eigenvalue} of a {Riemann} {Surface.}}, journal = {Mathematische Zeitschrift}, pages = {87--100}, publisher = {mathdoc}, volume = {162}, year = {1978}, zbl = {0371.53032}, url = {http://geodesic.mathdoc.fr/item/MZ_1978__162_172717/} }
Peter Buser. Cubic Graphs and the First Eigenvalue of a Riemann Surface.. Mathematische Zeitschrift, Tome 162 (1978), pp. 87-100. http://geodesic.mathdoc.fr/item/MZ_1978__162_172717/