by Hedstrom, Gilbert S., McLean, Ronald A.N., Metzger, Bernhard H.
Published in Greener management international (01.10.1997)

by BOEHM, P. D, METZGER, B. H
Published in Chemical engineering progress (01.06.1999)

by Metzger, Bernhard H
Published in ENR (03.06.1996)

by Hedstrom, Gilbert S., McLean, Ronald A.N., Metzger, Bernhard H.
Published in Growing Pains (1999)