where i = 1, 2, 3, and 4. To determine x let us step by step exclude unknown parameters No (R), k1 (r ), and then p. In the first we exclude No (R) by forming from four Eq. 2.42.13 for different i three equations for ratios
where i = 2, 3, and 4. To exclude k1(r ) let us take logarithm from both parts of Eq. 2.42.14 and then divide one equation on another; as result we obtain following two equations:
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