We consider the problem of determining for which integers k and n can a minimum k-perfect covering on n points be embedded in the real projective plane.

@article{Moore1990OnTN,
title={On the number of connecting lines determined by n points in the real plane},
author={Paul Moore and Rolf S. Rees},
journal={Australasian J. Combinatorics},
year={1990},
volume={1},
pages={127-148}
}