@article{hrj:643,
    title      = {On warning's problem : g (4) < 21},
    author     = {R Balasubramanian},
    url        = {https://hrj.episciences.org/643},
    doi        = {10.46298/hrj.1979.643},
    journal    = {Hardy-Ramanujan Journal},
    issn       = {2804-7370},
    volume     = {Volume 2 - 1979},
    eid        = 1,
    year       = {1979},
    month      = {Jan},
    keywords   = {singular series., Hardy-Littlewood circle method, sum of fourth powers, [MATH]Mathematics [math]},
    language   = {English},
}