1. Dow, S., ‘Extending Partial Projective Planes’, Congressus Numerantium 35 (1982), 245–251.
2. Dow, S., ‘An Improved Bound for Extending Partial Projective Planes’, Discrete Math. 45 (1983), 109–207.
3. Hall, J. I., ‘Bounds for Equidistant Codes and Partial Projective Planes’, Discrete Math. 17 (1977), 85–94.
4. McCarthy, D. and Vanstone, S. A., ‘Embedding (r, 1)-Designs in Finite Projective Planes’, Discrete Math. 19 (1977), 67–76.
5. Vanstone, S. A., ‘The Extendability of (r, 1)-Designs’ Proc. Third Manitoba Conf. on Numerical Math., 1973, pp. 409–418.