@article{AFST_2013_6_22_2_253_0,
     author = {Andreas Fischer and Murray Marshall},
     title = {Extending piecewise polynomial functions in two variables},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {253--268},
     publisher = {Universit\'e Paul Sabatier, Institut de Math\'ematiques},
     address = {Toulouse},
     volume = {Ser. 6, 22},
     number = {2},
     year = {2013},
     doi = {10.5802/afst.1372},
     zbl = {1279.14069},
     language = {en},
     url = {https://afst.centre-mersenne.org/articles/10.5802/afst.1372/}
}