Dergiler / Turkish Journal of Physics / 1999 / Cilt: 23 - Sayı: 1Kosterlitz-Thouless phase transition or asymptotic freedom in two-dimensional O(N) spin systemsMehmet DİLAVER,Bartolemeo ALLES,Giancarlo CELLA,Yiğit GÜNDÜÇDergiTurkish Journal of PhysicsSayı1999 · Cilt: 23 - Sayı: 1Sayfa227–228DOI—