@article{10_4153_CJM_1979_103_x,
     author = {G\"uunther, Georg and Nolte, Wolfgang},
     title = {Defining {Relations} in {Orthogonal} {Groups} of {Characteristic} {Two}},
     journal = {Canadian journal of mathematics},
     pages = {1217--1246},
     year = {1979},
     volume = {31},
     number = {6},
     doi = {10.4153/CJM-1979-103-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1979-103-x/}
}