Gradient-constrained minimum networks (II). Labelled or locally minimal Steiner points.

Marcus Brazil D. A. Thomas J. F. Weng Gradient-constrained minimum networks (II). Labelled or locally minimal Steiner points. 23-37 2008 42 J. Global Optimization 1 http://dx.doi.org/10.1007/s10898-007-9201-x db/journals/jgo/jgo42.html#BrazilTW08