 For their determination BKL used (with due reservations) an approximate method based on the assumption of statistical independence of the random quantity δ("s") and of the random quantities "k"("s"), "x"("s").For the function "P"(δ) an integral equation was set up which expressed the fact that the quantities δ("s"+1) and δ("s") interconnected by the relation have the same distribution; this equation was solved numerically.In a later work, KL et al.