An improved version of a previously reported program for molecular calculat
ions with B functions is presented. In this version, new algorithms for the
three- and four-center electron repulsion integrals are used. The mathemat
ical aspects of the algorithms are recognized and their performance analyze
d. The results on full molecular calculations confirm the higher efficiency
of the new algorithms in comparison with the old ones. (C) 1999 Elsevier S
cience B.V. All rights reserved.