THE P(1)P(2)/D HYPOTHESIS: THE CASE OF RAILWAY EXPRESS

[1] Auerbach F, 1913, PETERMANNS MITT, V59, P74

[2] STEWART JQ, 1941, SCIENCE, P89

[3] INTERVENING OPPORTUNITIES: A THEORY RELATING MOBILITY AND DISTANCE [J]. AMERICAN SOCIOLOGICAL REVIEW, 1940, 5 (06) : 845 - 867

[4] Zipf G.K., 1941, NATL UNITY DISUNITY

[5] THE UNITY OF NATURE, LEAST-ACTION, AND NATURAL SOCIAL SCIENCE [J]. SOCIOMETRY, 1942, 5 (01) : 48 - 62

[6] THE GENERALIZED HARMONIC SERIES AS A FUNDAMENTAL PRINCIPLE OF SOCIAL ORGANIZATION [J]. PSYCHOLOGICAL RECORD, 1940, 4 (05) : 43 - 43

[1] Auerbach F, 1913, PETERMANNS MITT, V59, P74

[2] STEWART JQ, 1941, SCIENCE, P89

[3] INTERVENING OPPORTUNITIES: A THEORY RELATING MOBILITY AND DISTANCE [J]. AMERICAN SOCIOLOGICAL REVIEW, 1940, 5 (06) : 845 - 867

[4] Zipf G.K., 1941, NATL UNITY DISUNITY

[5] THE UNITY OF NATURE, LEAST-ACTION, AND NATURAL SOCIAL SCIENCE [J]. SOCIOMETRY, 1942, 5 (01) : 48 - 62

[6] THE GENERALIZED HARMONIC SERIES AS A FUNDAMENTAL PRINCIPLE OF SOCIAL ORGANIZATION [J]. PSYCHOLOGICAL RECORD, 1940, 4 (05) : 43 - 43