@article{MZM_2000_68_2_a9,
     author = {A. A. Makhnev},
     title = {Affine ovoids and extensions of generalized quadrangles},
     journal = {Matemati\v{c}eskie zametki},
     pages = {266--271},
     year = {2000},
     volume = {68},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2000_68_2_a9/}
}