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Acta Oeconomica
Authors:
Szabolcs Szilárd Sebrek
and
Betsabé Pérez Garrido
. Jaffe , A. — Trajtenberg , M. — Henderson , R. ( 1993 ): Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations . Quarterly Journal of Economics , 108 ( 3 ): 577 – 598