No CrossRef data available.
* ‘A plane configuration is a finite system of p points and g straight lines in the plane arranged in such a way that every point is incident to a fixed number γ of straight lines, while every line is incident to a fixed number π of points … The numbers p, g, γ, π are connected by the relation pγ = gπ.’ [Encyclopaedia of Mathematics, Kluwer (1987) pp. 793–794.