@article{SF_1983__27_134626,
     author = {S.W. Margolis and J.H. Dinitz},
     title = {Translational hulls and block designs.},
     journal = {Semigroup forum},
     pages = {247--264},
     publisher = {mathdoc},
     volume = {27},
     year = {1983},
     zbl = {0521.20049},
     url = {http://geodesic.mathdoc.fr/item/SF_1983__27_134626/}
}