@article{MS2_1956__4_165608,
     author = {V.L.jr. KLEE},
     title = {The structure of semispaces},
     journal = {Mathematica Scandinavica},
     pages = {54--64},
     publisher = {mathdoc},
     volume = {4},
     year = {1956},
     zbl = {0070.39203},
     url = {http://geodesic.mathdoc.fr/item/MS2_1956__4_165608/}
}