1 Levin, A., "Unit root tests in panel data: Asymptotic and finite sample properties" Asymptotic and finite sample properties,Journal of Econometrics,108,pp.1 24. 108 : 1-24, 2002
2 Levin, A., "Unit Root Tests in Panel Data: New Results, Discussion Paper" University of California 1993
3 Levin, A., "Unit Root Tests in Panel Data: Asymptotic and Finite Sample Properties, Discussion Paper" University of California 1992
4 Funk, M., "Trade and international R&D spillovers among OECD countries" 67 : 725-736, 2001
5 Nicita, A., "Trade and Production, Working Paper" The World Bank 2001
6 Im, K., "Testing for unit roots in heterogeneous panels" 115 : 53-74, 2002
7 Hadri, K, "Testing for stationarity in heterigenous panel data" 3 : 148-161, 2000
8 Edmond, C., "Some panel cointegration models of international R&D spillovers" 23 : 241-260, 2001
9 Pedroni, P., "Panel Cointegration: Asymptotic and Finite Sample Properties of Pooled Time Series Tests with an Application to the PPP Hypothesis: New Results" Indiana University 1997
10 Kao, C., "On the estimation and inference of a cointegrated regression in panel data" 15 : 179-222, 2000
1 Levin, A., "Unit root tests in panel data: Asymptotic and finite sample properties" Asymptotic and finite sample properties,Journal of Econometrics,108,pp.1 24. 108 : 1-24, 2002
2 Levin, A., "Unit Root Tests in Panel Data: New Results, Discussion Paper" University of California 1993
3 Levin, A., "Unit Root Tests in Panel Data: Asymptotic and Finite Sample Properties, Discussion Paper" University of California 1992
4 Funk, M., "Trade and international R&D spillovers among OECD countries" 67 : 725-736, 2001
5 Nicita, A., "Trade and Production, Working Paper" The World Bank 2001
6 Im, K., "Testing for unit roots in heterogeneous panels" 115 : 53-74, 2002
7 Hadri, K, "Testing for stationarity in heterigenous panel data" 3 : 148-161, 2000
8 Edmond, C., "Some panel cointegration models of international R&D spillovers" 23 : 241-260, 2001
9 Pedroni, P., "Panel Cointegration: Asymptotic and Finite Sample Properties of Pooled Time Series Tests with an Application to the PPP Hypothesis: New Results" Indiana University 1997
10 Kao, C., "On the estimation and inference of a cointegrated regression in panel data" 15 : 179-222, 2000
11 Kao, C., "International R&D spillovers: An application of estimation and inference in panel cointegration" An application of estimation and inference in panel cointegration,Oxford Bulletin of Economics and Statistics,61,pp.691 709. 61 : 691-709, 1999
12 Lichtenberg, F. R., "International R&D spillovers: A re-examination" A re-examination,European Economic Review,428,pp.1483 1491. 428 : 1483-1491, 1998
13 Coe, D. T, "International R&D spillovers" 39 : 859-887, 1995
14 Grossman, G. M., "Innovation and Growth in the Global Economy" MIT Press 1991
15 Chen, B., "Estimation and inference of a cointegrated regression in panel data: A Monte Carlo study" A Monte Carlo study,American Journal of Mathematical and Management Sciences,19,pp.75 114. 19 : 75-114, 1999
16 Pedroni, P., "Critical values for cointegration tests in heterogeneous panels with multiple regressors" 61 : 653-670, 1999