Herbert Edelsbrunner Michael A. Facello Jie Liang On the Definition and the Construction of Pockets in Macromolecules. 83-102 1998 88 Discrete Applied Mathematics 1-3 http://dx.doi.org/10.1016/S0166-218X(98)00067-5 db/journals/dam/dam88.html#EdelsbrunnerFL98