Harper, L.H. and Dreier, D. 2003. The edge-isoperimetric problem on the 600-vertex regular solid. Linear Algebra and its Applications, Vol. 368, Issue. , p. 209.
Bérard, Pierre H. 1988. From vanishing theorems to estimating theorems: the Bochner technique revisited. Bulletin of the American Mathematical Society, Vol. 19 ...