@article{SJIM_2003_6_3_a4,
     author = {A. V. Gavrilov},
     title = {A~generalization of the {Christoffel{\textendash}Darboux} formula},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {67--69},
     year = {2003},
     volume = {6},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2003_6_3_a4/}
}