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1by Robert Christian P.
Economica 1992Book -
2by Robert Christian P.
Springer cop. 2001Book -
3by Robert Christian P.
Springer cop. 2007Book -
4by Robert Christian P.
Économica DL 1996, cop. 1996Book -
5by Robert Christian P.
Springer DL 2005, cop. 2006Book -
6Book
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7Book
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8Book
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9Book
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10Book
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11Springer copyright 1998Book