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2010 2nd International Conference on Education Technology and Computer > 1 > V1-451 - V1-455
Ecological Economics > 2010 > 69 > 6 > 1193-1201
Gospodarka Narodowa. The Polish Journal of Economics > 2010 > 237 > 1-2 > 127-137
Olsztyn Economic Journal > 2010 > 5 > 1 > 90-109