TY - JOUR AU - Hein, Nickolas AU - Sottile, Frank AU - Zelenko, Igor TI - A Congruence Modulo Four for Real Schubert Calculus with Isotropic Flags JO - Canadian mathematical bulletin PY - 2017 SP - 309 EP - 318 VL - 60 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-2016-087-2/ DO - 10.4153/CMB-2016-087-2 ID - 10_4153_CMB_2016_087_2 ER -