@article{10_4064_cm_15_1_111_113,
     author = {Z. Ziele\'zny},
     title = {A remark on hypoelliptic differential and convolution operators},
     journal = {Colloquium Mathematicum},
     pages = {111--113},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1966},
     doi = {10.4064/cm-15-1-111-113},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-15-1-111-113/}
}