@article{JETPL.113.406,
    title = {On the Nonlocal Darboux Transformation for Time-Independent Axially Symmetric Schr?dinger and Helmholtz Equations},
    author = {Kudryavtsev, A. G.},
    journal = {JETP Lett.},
    volume = {113},
    issue = {6},
    pages = {409},
    year = {2021},
    doi = {10.1134/S0021364021060084},
    url = {http://jetpletters.ru/ps/dx/10.31857/S1234567821060082},
    note = {[Pisma v ZhETF 113, 406 (2021)]}
}