@article{JAC_1993__2_4_a1,
     author = {Leung, Ka Hin and Ma, Siu Lun},
     title = {Partial difference triples},
     journal = {Journal of Algebraic Combinatorics},
     pages = {397--409},
     publisher = {mathdoc},
     volume = {2},
     number = {4},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_1993__2_4_a1/}
}