@article{AFM_2007_32_2_a10,
     author = {Janez Mrcun and Peter Semrl},
     title = {Multiplicative bijections between algebras of differentiable functions},
     journal = {Annales Fennici Mathematici},
     pages = {471--480},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_2007_32_2_a10/}
}