Literature
W. Eberhard and G. Freiling, Stone - reguläre Eigenwertprobleme. Math. Z. 160, 139–161 (1978).
G. Frei Ling, Reguläre Eigenwertprobleme mit Mehrpunkt-Integral-Randbedingungen. Math. Z. 171, 113–131 (1980)
M.G. Gasymov and A.M. Magerramov, Investigation of a class of differential operator pencils of even onder. Soviet Math Dokl. 26, 55–58 (1982).
G. Heisecke, Rand-Eigenwertprobleme N(y) = λP(y) bei λ-abhängigen Randbedingungen. Mitt. Math. Sem. Gießen 145, 1–74 (1980).
R.E. Langer, On the zeros of exponential sums and integrals. Bull. Am. Math. Soc. 37, 213–239 (1931).
R.E. Langer, The boundary problem of an ordinary linean. differential system in the complex domain. Trans. Am. Soc. 46, 151–190 (1939), correction 467.
L.A. McColl, On the distribution of the zeros of sums of exponentials and polynomials. Trans. Am. Math. Soc. 36, 341–360 (1934).
M.A. Naimark, Linear differential operators, port I and part II. F. Ungar, New York, 1967.
P. Noaillon, Développements asymptotiques dans les équations differentielles linéaires á paramétre variable. Mémoires de la Soc. des Sc. de Liège, 3. Série, IX, 197 pages (1912).
M.B. Orazov and A.A. Shkalikov, Then n-fold basis property of the characteristic functions of certain regular. boundary-value, problems. Sib. Math. J. 17, 483–492 (1976).
A.S. Pechentsov, Asymptotic expansions of linear differential equations containing a porameter. Diff. Equ. 17, 1023–1031 (1981).
A.S. Pechentsov, Roundary-value problems for. differential equations with. a panameter, having charcteristic equations with multiple roots. Diff. Equ. 20, 206–215 (1984).
M.H. Stone, A comparison of the series of Fourier and Birkhoff. Trans. Am. Math. Soc. 28, 695–761 (1926).
J.D. Tamarkin, Some general problems of the theory of ordinary linear differential equations and. expansions of an arbitrary function in series of fundamental functions. Math. Z. 27, 1–54 (1927).
W.J. Trjitzinsky, Theory of linear differential equations containing a parameter. Acta Math. 67, 1–50 (1936).
H.L. Turrittin, Asymptotic solutions of certain ordinary differential equations associated with multiple roots of the characteristic equation. Am. J. of Math. 58, 364–376 (1936).
H.L. Turrittin, Asymptotic expansions of solutions of systems of ordinary linear differential equations containing a parameter. Contributions to the theory of nonlinear oscillations, Vol. 2, Princeton Univ. Press, 81–116 (1952).
H.L. Turrittin, Asymptotic distribution of zeros for certain exponential sums. Amer. J. of Math. 66, 199–228 (1944).
M. Wolter, Über die Entwicklung nach. Eigenfunktionen N-irregulären. Eigenwertprobleme mit zerfallenden Randbedingungen. Math. Z. 178, 99–113 (1981)
R. Mennicken and M. Möller, Boundary eigenvalue problems. Notas de Algebra y Analysis 14, 100 pages (1986), Bahia Bianca Argentinia.
R. Mennicken and M. Möller, Root functions of boundary eigenvalue operator, functions. Integral Equ. and Operator Theory 9, 237–265 (1986).
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Freiling, G. Boundary value problems associated with multiple roots of the characteristic equation. Results. Math. 11, 44–62 (1987). https://doi.org/10.1007/BF03323258
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DOI: https://doi.org/10.1007/BF03323258