Granger, C.W.J..
Trading in Commodities / - Fourth Ed. / - Cambridge CB2 1QY : Woodhead-Faulker Ltd. , 2002 - p158 :
0-85941-178-8
Economics
X8(J):5 / M3
Trading in Commodities / - Fourth Ed. / - Cambridge CB2 1QY : Woodhead-Faulker Ltd. , 2002 - p158 :
0-85941-178-8
Economics
X8(J):5 / M3