@article{1102994417, author = {Persinger, C. A.}, title = {Subsets of $n$-books in $E^{3}$.}, journal = {Pacific J. Math.}, volume = {19}, number = {3}, year = {1966}, pages = { 169-173}, language = {en}, url = {http://dml.mathdoc.fr/item/1102994417} }
Persinger, C. A. Subsets of $n$-books in $E^{3}$.. Pacific J. Math., Tome 19 (1966) no. 3, pp. 169-173. http://gdmltest.u-ga.fr/item/1102994417/