by Carter,M.R.
by Walton,W.C.
by Lal, Rattan.
by Jayawardane, N.S.
by Rechcigl,J.E.
by Quattrochi,D.A.
by Patnaik,P.
by Gliessman,S.R.
by Brussaard,L.
by Rechcigl,N.A.
by Jorgensen,S.E | Muller,F.
by Frohn, R.C.
by Rechcigi, J.E.
by Hudak, A.F.
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