@article{COCV_2006__12_2_253_0,
     author = {Kreiner, Carl-Friedrich and Zimmer, Johannes},
     title = {Topology and geometry of nontrivial rank-one convex hulls for two-by-two matrices},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {253--270},
     publisher = {EDP-Sciences},
     volume = {12},
     number = {2},
     year = {2006},
     doi = {10.1051/cocv:2005036},
     mrnumber = {2209353},
     zbl = {1108.49010},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/cocv:2005036/}
}