（1）Regional growth in West Germany: convergence or divergence?

[url=][/url] [url=][/url]

Economic Modelling
Volume 16, Issue 4, 1 December 1999, Pages 489-502
url:[url]http://dx.doi.org/10.1016/S0264-9993(99)00011-5[/url]
(2)Cross-country growth regressions: problems of heterogeneity, stability and interpretation  Authors: G. S. Maddala ;S. Wu
DOI: 10.1080/000368400322534
Publication Frequency: 24 issues per year
Published in: Applied Economics, Volume 32, Issue 5 April 2000 , pages 635 - 642
url:[url]http://www.informaworld.com/smpp/content~content=a713758541&db=all[/url]
(3)Parameter heterogeneity in growth regressions

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Economics Letters
Volume 101, Issue 2, November 2008, Pages 126-129
http://dx.doi.org/10.1016/j.econlet.2008.07.011

(4)Parametric variability in cross-country growth regressions: An application of quantile-regression methodology

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Economics Letters
Volume 99, Issue 2, May 2008, Pages 387-389
url:[url]http://dx.doi.org/10.1016/j.econlet.2007.09.003[/url]