%0 Journal Article %A Hein, Nickolas %A Sottile, Frank %A Zelenko, Igor %T A Congruence Modulo Four for Real Schubert Calculus with Isotropic Flags %J Canadian mathematical bulletin %D 2017 %P 309-318 %V 60 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-2016-087-2/ %R 10.4153/CMB-2016-087-2 %F 10_4153_CMB_2016_087_2