By Lewis John R.   in Natural Product Reports

ISSN:0265-0568|15|4|371-395

R S C Publications‎(1998)‎

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By Thompson Kenneth N   Coe Barbara J   Lewis John R   in The Journal of Business and Industrial Marketing

ISSN:0885-8624|9|2|29-40

Emerald Group Publishing Ltd‎(1994)‎

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