Whalley, Brian W. and Julian D. Orford. "The use of fractals and pseudofractals in the analysis of two-dimensional outlines: review and further exploration." Computers & Geosciences 15/2 (1989): 185–197.

Whalley, Brian W. and Julian D. Orford. "The use of fractals and pseudofractals in the analysis of two-dimensional outlines: review and further exploration." Computers & Geosciences 15/2 (1989): 185–197.