@article{UZERU_2014_3_a0,
     author = {Yu. A. Ashrafyan and T. N. Harutyunyan},
     title = {On a property of norming constants of {Sturm{\textendash}Liouville} problem},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {3--7},
     publisher = {mathdoc},
     number = {3},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2014_3_a0/}
}