@article {STANLEY2000,
	title = {Scale invariance and universality: organizing principles in complex systems},
	journal = {Physica A: Statistical Mechanics and its Applications},
	volume = {281},
	year = {2000},
	pages = {60{\textendash}68},
	issn = {03784371},
	doi = {10.1016/S0378-4371(00)00195-3},
	url = {http://linkinghub.elsevier.com/retrieve/pii/S0378437100001953},
	author = {STANLEY, H and AMARAL, L and Gopikrishnan, P and IVANOV, P and Keitt, T and Plerou, V}
}
