@article{10_4153_CJM_1976_039_7,
     author = {L\"uneburg, Heinz},
     title = {Characterizations of the {Generalized} {Hughes} {Planes}},
     journal = {Canadian journal of mathematics},
     pages = {376--402},
     year = {1976},
     volume = {28},
     number = {2},
     doi = {10.4153/CJM-1976-039-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-039-7/}
}