@article{UFA_2020_12_2_a0,
     author = {A. A. Allahverdyan and A. B. Shabat},
     title = {Products of eigenfunctions and {Wronskians}},
     journal = {Ufa mathematical journal},
     pages = {3--9},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2020_12_2_a0/}
}