Refs for CUBING and/or other contacts calculation algs wanted

[Dawn Cohen]

Does anyone have pointers to an algorithm known as "CUBING", which I
am told is good for calculating distances?  

Also, are there any pointers on algorithms commonly used for
calculating contacts or distances between sets of atoms.  (e.g.,
given a crystal structure, calculate all the contacts between
solvents and protein, that are between 2.6 and 3.2 A.)

Thanks!