Dergiler / Turkish Journal of Mathematics / 1999 / Cilt: 23 - Sayı: 4Shafarevich-Tate set for $y^4=x^4-ell^4$Takashi ONODergiTurkish Journal of MathematicsSayı1999 · Cilt: 23 - Sayı: 4Sayfa557–573DOI—