Auernhammer, H., Combine Harvester Traces "oberes Geiswegfeld" in Scheyern 1992 (online DGPS: ASHTECH MXII - Basestation + ASHTECH OEM - Sensor, MF40RS 18, DATAVISION, sliding middle from 3 data, extremes deleted). AgTecCollection: Institut für Landtechnik TUM / Zeichenbüro, TU München 2004,https://mediatum.ub.tum.de/710133