Reference health
Telephone calls and communication barriers
9/9 checkable references clean · checked 2026-09-01
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a retraction, withdrawal, or removal notice.
8 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 9 checked references that resolve
resolves10.1016/0166-0462(75)90003-4
A general framework for the development of gravity-type trip distribution models
resolves10.1111/j.1467-9787.1982.tb00744.x
A METHOD OF FITTING THE GRAVITY MODEL BASED ON THE POISSON DISTRIBUTION*
The 8 references without a DOI — listed, not checked
no DOI — not checkedAlonso W (1978) A theory of movements. In: Hansen NM (ed) Human settlement systems. Ballinger, Cambridge, MA, pp 197–211
no DOI — not checkedBröcker J (1984) How do international trade barriers affect interregional trade? In: Anderson AE, Isard W, Puu T (eds) Regional and industrial development. North-Holland, Amsterdam, pp 219–239
no DOI — not checkedBröcker J, Rohweder HC (1989) Ein multilaterales Modell des Welthandels. Institut für Regional-forschung, Universität Kiel, Kiel
no DOI — not checkedFotheringham AS, O'Kelly ME (1989) Spatial interaction models. Kluwe, Dordrecht
no DOI — not checkedInternational Telecommunications Union (ITU) Statistical Yearbook 1977–1986
no DOI — not checkedNuesser HG (1985) Die Bedeutung von Hemmnisfaktoren für die Entwicklung des Verkehrsaufkommens. DFVLR-Nachrichten 45:32–34
no DOI — not checkedOECD (1986) Monthyl statistics of foreign trade
no DOI — not checkedWilson AG (1976) Urban and regional models in geography and planning. Wiley, London
What this badge says. CiteStamped means the CHECKABLE references of this
work were clean at the dated check: each resolved to a known work in a public registry, and none
carried a retraction notice at that time. It says nothing about the quality, findings,
or importance of the work itself, and nothing about references deposited without a DOI.
checked 2026-09-01 — re-checked daily as this page is visited; titles and statuses come from Crossref and DataCite and are not part of the signed record
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