1. A. R. Calderbank, R. H. Hardin, E. M. Rains, P. W. Shor, and N. J. A. Sloane, A group-theoretic framework for the construction of packings in Grassmannian spaces, J. Algebraic Combin. 9 (1999), no. 2, 129–140.[MR]
  2. A. Robert Calderbank, Eric M. Rains, P. W. Shor, and Neil J. A. Sloane, Quantum error correction via codes over GF(4), IEEE Trans. Inform. Theory 44 (1998), no. 4, 1369–1387.[MR]
  3. P. W. Shor and N. J. A. Sloane, A family of optimal packings in Grassmannian manifolds, J. Algebraic Combin. 7 (1998), no. 2, 157–163.[MR]