1. “Some Notes on Ordered Random Intervals.”;Barton;Journal of the Royal Statistical Society, Ser. B,1956
2. “The Random Spatial Economy: An Explanation in Settlement Theory.”;Curry;Annals of the Association of American Geographers,1964
3. “A Zipf-Type Formula for a Set of Noninteracting Urban Places.”;Gusein-Zade;Vestnik of the Moscow University,1975