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[ 8 ] Я. Gollwitzer, Stokes Multipliers for Subdominant Solutions of Second Order Differential Equations with nomial Coefficients, Ph. D. Thesis, Univ. of Minnesota 1967.

Dept . of Mathematics, Univ. of Tennessee, Knoxville, Tennessee School of Mathematics, Univ. of Minnesota, Minneapolis, Minnesota

Eingegangen 5. Mai 1968