@article{PismaZhETF.24.196,
    title = {New example of quantum-mechanical problem with hidden symmetry},
    author = {Pron'ko, G. P. and Stroganov, Yu. G.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {24},
    issue = {4},
    pages = {196},
    year = {1976},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_27794.shtml},
}