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Publisher
- arxiv3
- springer2
- world scientific and engineering academy and society (wseas)2
- xarxa de referencia en economia aplicada (xreap)2
- calgary: international telecommunications society (its)1
- elsevier1
- universidad complutense de madrid1
- universidad de alcala1
- wiley-blackwell, 111 river st, hoboken 07030-5774, nj usa1