TY  - JOUR
AU  - L. G. Valiullina
AU  - Kh. K. Ishkin
AU  - R. I. Marvanov
TI  - Spectral asymptotics  for  fourth order differential operator  with two turning points
JO  - Ufa mathematical journal
PY  - 2018
SP  - 24
EP  - 39
VL  - 10
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/UFA_2018_10_4_a2/
LA  - en
ID  - UFA_2018_10_4_a2
ER  -