D. Smith

Mercury Measurement and Its Control: What We Know, Have Learned, and Need to Further Investigate.

T. D. Brown, T D Brown, W J O'Dowd, 1999, Journal of the Air & Waste Management Association.

A survey of schemes in the United Kingdom collecting plastic bottles for recycling

D. N. Smith, L. M. Harrison, A. J. Simmons, 1999 .