@InProceedings{BFHU07,
author    = {Tom Bobach and Gerald Farin and Dianne Hansford and Georg Umlauf},
title     = {Discrete harmonic functions from local coordinates},
booktitle = {Mathematics of Surfaces XII},
year      = 2007,
publisher = {Springer-Verlag},
editor    = {R.~Martin and M.~Sabin and J.~Winkler},
pages     = {93-103}
}