The left-hand term of eq 18 that for the sake of simplicity we indicate as k2*, can be evaluated by introducing the approximate value of k, and k4tm/k-4 just obtained. Applying the same mathematical treatment of eq 16 to eq 18 affords: ... With the introduction of these terms into eq 7, better values of [k4k4,""[amI2/(k4 + k4,""[am])] are obtained, and so on, until constant values of k2, k4, k2pam/k-2, and k4p"m/k-4 are obtained. Actually this iterative procedure was carried out ...