“…We will not consider in detail this subject here, assuming this function as given. For this important topic the reader is referred to the literature, in particular to that dealing with complementary variational techniques, which appear especially suited to the determination of physically significant local error functions linked to local and global energy estimates (Albanese and Rubinacci, 1998;Golias er al., 1994;Marmin et al, 1998;Oden, 1973;Penman, 1988;Remacle et al, 1998;Rikabi et al, 1988). Substituting the reconstruction operators [Eqs.…”