@article{10_4153_CJM_1981_105_7,
     author = {Phelps, K. T.},
     title = {Direct {Product} of {Derived} {Steiner} {Systems} {Using} {Inversive} {Planes}},
     journal = {Canadian journal of mathematics},
     pages = {1365--1369},
     year = {1981},
     volume = {33},
     number = {6},
     doi = {10.4153/CJM-1981-105-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-105-7/}
}