The P1 P2/D Hypothesis: On the Intercity Movement of Persons. Zipf, G. K. American Sociological Review, 11(6):677–686, 1946. 00000 Publisher: [American Sociological Association, Sage Publications, Inc.]
The P1 P2/D Hypothesis: On the Intercity Movement of Persons [link]Paper  doi  bibtex   
@article{zipf_p1_1946,
	title = {The {P1} {P2}/{D} {Hypothesis}: {On} the {Intercity} {Movement} of {Persons}},
	volume = {11},
	issn = {0003-1224},
	shorttitle = {The {P1} {P2}/{D} {Hypothesis}},
	url = {https://www.jstor.org/stable/2087063},
	doi = {10.2307/2087063},
	number = {6},
	urldate = {2020-11-11},
	journal = {American Sociological Review},
	author = {Zipf, George Kingsley},
	year = {1946},
	note = {00000 
Publisher: [American Sociological Association, Sage Publications, Inc.]},
	pages = {677--686},
}

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