Computing surface of constant mean curvature with singularities. - Denton E. Hewgill (Computing, 1984)

Exact Computation of Steiner Minimal Trees in the Plane. - Ernest J. Cockayne; Denton E. Hewgill (Inf. Process. Lett., 1986)

Improved Computation of Plane Steiner Minimal Trees. - Ernest J. Cockayne; Denton E. Hewgill (Algorithmica, 1992)