Dynamics of two-sign point vortices in positive and negative temperature states Yatsuyanagi, Yuichi ; Kiwamoto, Yasuhito ; Tomita, Hiroyuki ; Sano, Mitsusada M. ; Yoshida, Takeshi ; Ebisuzaki, Toshikazu Abstract Publication: Journal of Plasma Physics Pub Date: December 2006 DOI: 10.1017/S0022377806005034 Bibcode: 2006JPlPh..72..865Y