@article{10_4064_cm97_2_2,
     author = {J\"urgen Hausen},
     title = {A {Hilbert{\textendash}Mumford} criterion for $SL_2$-actions},
     journal = {Colloquium Mathematicum},
     pages = {151--161},
     publisher = {mathdoc},
     volume = {97},
     number = {2},
     year = {2003},
     doi = {10.4064/cm97-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm97-2-2/}
}