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- [7] NUMBER OF EIGENVALUES FOR A BOUNDARY-VALUE PROBLEM WITH AN INCREASING PARAMETER JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1972, 4 (MAY): : 718 - &
- [10] ON SOME GENERALIZED FREE BOUNDARY-VALUE PROBLEM FOR A SYSTEM OF ONE-DIMENSIONAL DIFFUSION-EQUATIONS ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, 1981, 61 (11): : 541 - 545