TY - JOUR AU - Matthew St. Denis AU - Wai Ling Yee TI - A simplified proof of the reduction point crossing sign formula for Verma modules JO - Algebra and discrete mathematics PY - 2019 SP - 195 EP - 202 VL - 28 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ADM_2019_28_2_a4/ LA - en ID - ADM_2019_28_2_a4 ER -