@article{JAC_1994__3_4_a2,
     author = {Alspach, Brian and Xu, Ming-Yao},
     title = {1/2-transitive graphs of order $3p$},
     journal = {Journal of Algebraic Combinatorics},
     pages = {347--355},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_1994__3_4_a2/}
}