DuEPublico: Duisburg-Essen Publications Online (unknown number of records) - 5 June 1997 [Record Details] |
VTT Technical Research Centre of Finland (43831 records) - 4 July 1997 [Record Details] |
CogPrints Cognitive Sciences Eprint Archive (4596 records) - 19 August 1997 [Record Details] |
Ecology and Society (1850 records) - 10 June 1997 [Record Details] |
SciELO - Chile (unknown number of records) - 1 January 1997 [Record Details] |
SciELO - Spain (30360 records) - 1 January 1997 [Record Details] |