Potentsiaalide seostamine nn. gravitatsioonimudeliga annaks neile küll laiema sisu ja võimaldaks julgemaid analoogiaid, ent [...] gravitatsioonimudel geograafias on põhjendamatu füüsikaline analoogia ja temale toetuvad järeldused on õiged ainult niivõrd, kuivõrd neid saab tõestada gravitatsioonimudelist sõltumatult.
The earliest versions of spatial interaction models assumed that the flow between demand and service centres was directly proportional to the associated demand and attraction and inversely proportional to the square of the distance between them, giving rise to the concept of a gravity model, by analogy with Newton's law of gravity.
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