@article{10_4153_CJM_1981_051_9,
     author = {Heldermann, N. C.},
     title = {Developability and {Some} {New} {Regularity} {Axioms}},
     journal = {Canadian journal of mathematics},
     pages = {641--663},
     year = {1981},
     volume = {33},
     number = {3},
     doi = {10.4153/CJM-1981-051-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-051-9/}
}