By Sigman H.   in Journal of Environmental Economics and Management

ISSN:0095-0696|35|3|205-224

Academic Press‎(1998)‎

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By Sigman H.   in Journal of Environmental Economics and Management

ISSN:0095-0696|30|2|199-217

Academic Press‎(1996)‎

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By Palmer K.   Sigman H.   Walls M.   in Journal of Environmental Economics and Management

ISSN:0095-0696|33|2|128-150

Academic Press‎(1997)‎

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By Keyser E.   Derossis A.   Antoniuk M.   Sigman H.   Fried G.   in Surgical Endoscopy

ISSN:0930-2794|14|2|149-153

Springer Publishing Company ‎(2000)‎

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