@article{Nassau2002,
  author    = {Christian Nassau},
  title     = {On the structure of P(n)*P(n) for p=2},
  journal   = {Transactions of the American Mathematical Society},
  volume    = {354},
  number    = {5},
  pages     = {1749 -- 1757},
  doi       = {10.1090/S0002-9947-02-02920-3},
  year      = {2002},
}