@article{10_4153_CMB_2016_087_2,
     author = {Hein, Nickolas and Sottile, Frank and Zelenko, Igor},
     title = {A {Congruence} {Modulo} {Four} for {Real} {Schubert} {Calculus} with {Isotropic} {Flags}},
     journal = {Canadian mathematical bulletin},
     pages = {309--318},
     year = {2017},
     volume = {60},
     number = {2},
     doi = {10.4153/CMB-2016-087-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2016-087-2/}
}