The following errors have been noticed in our published paper.(i) The signs should be changed to the opposite, on the right sides of the expressions in the following equations.Eq. (2.8) for j r and j .Eq. (2.11) for the last term.Eq. (2.13) for j r and j .In the derivatives of Eqs.(3.1), (3.4), (3.5), (3.6), (3.8).Upper term in Eq. (3.10).First term in Eq. (3.15.) (ii) The second sentence in the paragraph after Eq. (2.8) should be omitted.(iii) Eqs.(3.8) and (3.16) should have b 1 (1) = 0, instead of b 1 (x 1 ) = 0. (iv) In Eq. (3.9) the first expression should be written as b 1 (x) = x -1 (v) Figures 3-14 presented here substitute the old ones.The captions to these figures remain the same.-1 -0.8 -0.6 -0.4 -0.2 0 0 0.2 0.4 0.6 0.8 1 N 1 = 6.0 10 -2 N 2 = 0.6 N 3 = 6.
Бисноватый-Коган et al. (Mon,) studied this question.