By Kennedy P.E.   Siegfried J.J.   in Economics of Education Review

ISSN:0272-7757|16|4|385-394

Elsevier‎(1997)‎

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By Kennedy P.E.   Siegfried J.J.   in Economics Letters

ISSN:0165-1765|50|3|299-304

Elsevier‎(1996)‎

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By Alkhatib G.   Locati M.   Kennedy P.E.   Murphy P.M.   Berger E.A.   in Virology

ISSN:0042-6822|234|2|340-348

Elsevier‎(1997)‎

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