%0 Journal Article %A Matthias Keller %T An overview of curvature bounds and spectral theory of planar tessellations %J Actes des rencontres du CIRM %D 2013 %P 61-68 %V 3 %N 1 %I CIRM %U https://acirm.centre-mersenne.org/articles/10.5802/acirm.55/ %R 10.5802/acirm.55 %G en %F ACIRM_2013__3_1_61_0