@article{AM2_1986__30_137114,
     author = {S.A. Vanstone and E.R. Lamken},
     title = {Elliptic semiplanes and group divisible designs with orthogonal resolutions.},
     journal = {Aequationes mathematicae},
     pages = {80--92},
     publisher = {mathdoc},
     volume = {30},
     year = {1986},
     zbl = {0586.05006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1986__30_137114/}
}