TY - JOUR AU - Knüppel, Frieder TI - A Class of Homomorphisms of Pre-Hjelmslev Groups JO - Canadian journal of mathematics PY - 1984 SP - 470 EP - 494 VL - 36 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1984-029-4/ DO - 10.4153/CJM-1984-029-4 ID - 10_4153_CJM_1984_029_4 ER -