@InProceedings{merz:spatio, author = {Alexander Knapp and Stephan Merz and Martin Wirsing}, title = {Refining Mobile UML State Machines}, booktitle = {10th Intl. Conf. Algebraic Methodology and Software Technology (AMAST 2004)}, year = 2004, editor = {Savi Maharaj and Charles Rattray and Carron Shankland}, series = {Lecture Notes in Computer Science}, address = {Stirling, Scotland}, month = {July}, publisher = {Springer-Verlag} }