@ARTICLE{
author={Okamoto A,Hara K,Nagaoka K,Yoshimura S,Vranjes Jovo,Kono M,Tanaka MY},
year={2003},
title={Experimental observation of a tripolar vortex in a plasma},
journal={PHYSICS OF PLASMAS},
volume={10},
number={6},
pages={2211-2216},
document_type={Article},
} 

@ARTICLE{
author={Vranjes Jovo,Okamoto A,Yoshimura S,Poedts S,Kono M,Tanaka MY},
year={2002},
title={Analytical description of a neutral-induced tripole vortex in a plasma},
journal={PHYSICAL REVIEW LETTERS},
volume={89},
number={26},
pages={-},
document_type={Article},
}