[1] Amos R. J., Everitt W. N.:
On a quadratic integral inequality. Proc. Roy. Soc. Edinburgh Sect. A 78 (1978), 241-256.
MR 0466454 |
Zbl 0393.26008
[6] Everitt W. N., Hinton D. B., Wong J. S. W.:
On the strong limit - $n$ classification of linear ordinary differential expressions of order 2$n$. Proc. London Math. Soc. 29 (1974), 351-367.
MR 0409956
[7] Everitt W. N.:
On the strong limit-point condition of second-order differential expressions. International conference on differential equations, 287-307, Academic Press, New York (1975).
MR 0435497 |
Zbl 0339.34018
[10] Friedrichs K. O.:
Spectral theory of operators in Hilbert space. Springer, Berlin (1973).
MR 0470698 |
Zbl 0266.47001
[12] Hinton D. В.:
Eigenfunction expansions and spectral matrices of singular differential operators. Proc. Roy. Soc. Edinburgh Sect. A 80 (1978), 289-308.
MR 0516229 |
Zbl 0389.34021
[13] Kolf H.:
Remarks on some Dirichlet type results for semibounded Sturm-Liouville operators. Math. Ann. 210 (1974), 197-205.
DOI 10.1007/BF01350583 |
MR 0355177
[14] Kato T.:
Perturbation theory for linear operators. (1st Edn.), Springer, Berlin (1966).
Zbl 0148.12601
[17] Naĭmark M. A.: Linear differential operators: II. Ungar, New York (1968).
[19] Sears D. B., Wray S. D.:
An inequality of C. R. Putnam involving a Dirichlet functional. Proc. Roy. Soc. Edinburgh Sect. A 75 (1976), 199-207.
MR 0445057 |
Zbl 0334.34024