@article{10_4064_cm122_2_9,
     author = {Piotr J\k{e}drzejewicz},
     title = {A note on rings of constants
 of derivations in integral domains},
     journal = {Colloquium Mathematicum},
     pages = {241--245},
     publisher = {mathdoc},
     volume = {122},
     number = {2},
     year = {2011},
     doi = {10.4064/cm122-2-9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm122-2-9/}
}