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Refs. 1-43. As it is seen from Table 1, various experimental and calculation methods were used for determining SEF. But the results for the same compounds by different researchers do not agree in spite of similar investigation methods. The considerable difference with each other of the SEF values does not permit to account the data reported by individual investigators to be reliable enough, as well as those by various groups. Therefore it is reasonable to use some statistical methods for deriving the more reliable values. In the present work for 12 complex oxides the series of average arithmetic values were derived as the basic SEF from the data of Table 1. The basic SEF's were used for the construction of the empirical dependencies of SEF on the number of oxygen atoms in a molecular unit of the compound, (m0), or on the

Standard Enthalpies of Formation for Some Phases in the YBaCuO System