For simplicity Berezhko et al. (M1988) considered the case when space diffusion coefficient does not depend from particle momentum; it means that
where D° = Dpp°). In this case Eq. 4.21.40 can be solved by the substitution f = ypx )p. The equation for y(x) will be dX ^ ur-*£|+ Dor(3 -rV = 0,
the solution of which in both regions i = 1,2 is
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