@article{VMUMM_2009_3_a7,
     author = {A. A. Shkalikov and J. Ben Amara},
     title = {Oscillation theorems for {Sturm--Liouville} problems with distribution potentials},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {43--49},
     publisher = {mathdoc},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2009_3_a7/}
}