An Estimate for the Fundamental Solutions of a Generalized Pell Equation. J.H.H. Chalk Mathematische Annalen
Linearly Independent Zeros of Quadratic Forms over Number-Fields. J.H.H. Chalk — 1980 Monatshefte für Mathematik
A study of Convex Cones from the point of view of the Geometry of Numbers. J.H.H. Chalk; C.A. Rogers — 1968 Journal für die reine und angewandte Mathematik