1. Booth R.S., Thomas D.A. and Weng J.F. (2004). Exactly Solvable and Unsolvable Shortest Network Problems in 3D-space. Contrib. Algebra Geometry 45: 649–663
2. Brazil M., Thomas D.A. and Weng J.F. (1998). Gradient-constrained minimal Steiner trees. DIMACS Ser. Discrete Math. Theor. Comput. Sci. 40: 23–38
3. Brazil M., Rubinstein J.H., Thomas D.A., Lee D., Weng J.F. and Wormald N.C. (2000). Network optimisation of underground mine design. Aust. Inst. Mining Metallurgy Proc. 305(1): 57–65
4. Brazil M., Rubinstein J.H., Thomas D.A., Weng J.F. and Wormald N.C. (2001). Gradient-constrained minimum networks (I). Fundamentals. J. Glob. Optim. 21: 139–155
5. Brazil M., Lee D., Rubinstein J.H., Thomas D.A., Weng J.F. and Wormald N.C. (2002). A network model to optimise cost in underground mine design. Trans. S. Afri. Inst. Elec. Eng. 93: 97–103