P. Stelldinger, U. Köthe, and H. Meine. Discrete Geometry for Computer Imagery, Proc. DGCI '06, volume 4245 of Springer LNCS, page 542--554. Springer, (2006)
H. Meine, P. Stelldinger, and U. Köthe. Discrete Geometry for Computer Imagery, Proc. DGCI '09, volume 5810 of Springer LNCS, page 193-202. Springer, (2009)