1. The Diameter of the World Wide Web;R Albert;Nature,1999
2. The Theory of Speculation. Trans. D. May;Louis Bachelier;Annales scientifiques de l'Ecole Normale Sup�rieure. Ser. 3,1900
3. Power-law distribution in the number of confirmed COVID-19 cases;Bernd Blasius;Chaos: An Interdisciplinary Journal of Nonlinear Science,2020