@article{CMH_1972__47_139512,
     author = {K. Varadarajan},
     title = {On {Topological} {Span}},
     journal = {Commentarii mathematici Helvetici},
     pages = {249--253},
     publisher = {mathdoc},
     volume = {47},
     year = {1972},
     zbl = {0244.57006},
     url = {http://geodesic.mathdoc.fr/item/CMH_1972__47_139512/}
}