CraigenSZ92'

@article{DBLP:journals/jct/CraigenSZ92,
  author    = {Robert Craigen and
               Jennifer Seberry and
               Xian-Mo Zhang},
  title     = {Product of Four Hadamard Matrices},
  journal   = {J. Comb. Theory, Ser. A},
  volume    = {59},
  number    = {2},
  year      = {1992},
  pages     = {318-320},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}