%0 Journal Article %A Kapl, Mario %A Sangalli, Giancarlo %A Takacs, Thomas %D 2020 %8 Array %P 67-86 %T Isogeometric analysis with C1 functions on planar, unstructured quadrilateral meshes %V S5 %R 10.5802/smai-jcm.52 %7 2021/06/02/ %J SMAI Journal of Computational Mathematics