@article{DANMA_2021_496_a1,
     author = {A. A. Vladimirov and A. A. Shkalikov},
     title = {On oscillation properties of self-adjoint boundary value problems of fourth order},
     journal = {Doklady Rossijskoj akademii nauk. Matematika, informatika, processy upravleni\^a},
     pages = {10--15},
     publisher = {mathdoc},
     volume = {496},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DANMA_2021_496_a1/}
}