Geodesic
Regularity of self-adjoint boundary conditions
Matematičeskie zametki, Tome 22 (1977) no. 6, pp. 835-846.

Voir la notice de l'article provenant de la source Math-Net.Ru

It is shown that self-adjoint boundary conditions for ordinary differential operators of odd order are regular in Birkhoff's sense. A similar result, for differential operators of even order, was proved by a different method by Salaff. In short, Kamke's hypothesis about the regularity of self-adjoint boundary conditions is completely confirmed. 
@article{MZM_1977_22_6_a5,
     author = {A. M. Minkin},
     title = {Regularity of self-adjoint boundary conditions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {835--846},
     publisher = {mathdoc},
     volume = {22},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_22_6_a5/}
}
TY  - JOUR
AU  - A. M. Minkin
TI  - Regularity of self-adjoint boundary conditions
JO  - Matematičeskie zametki
PY  - 1977
SP  - 835
EP  - 846
VL  - 22
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1977_22_6_a5/
LA  - ru
ID  - MZM_1977_22_6_a5
ER  - 
%0 Journal Article
%A A. M. Minkin
%T Regularity of self-adjoint boundary conditions
%J Matematičeskie zametki
%D 1977
%P 835-846
%V 22
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1977_22_6_a5/
%G ru
%F MZM_1977_22_6_a5
A. M. Minkin. Regularity of self-adjoint boundary conditions. Matematičeskie zametki, Tome 22 (1977) no. 6, pp. 835-846. http://geodesic.mathdoc.fr/item/MZM_1977_22_6_a5/