TY - JOUR AU - A. Hinkkanen TI - Sense-reversing generators of discrete convergence groups in the plane JO - Annales Fennici Mathematici PY - 1991 SP - 179 EP - 182 VL - 16 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1991.1612/ DO - 10.5186/aasfm.1991.1612 LA - en ID - AFM_1991_16_1_a14 ER -