@article{10_4064_cm_84_85_1_173_183,
     author = {Henryk \.Zo{\l}\k{a}dek},
     title = {Two remarks about {Picard-Vessiot} extensions and elementary functions},
     journal = {Colloquium Mathematicum},
     pages = {173--183},
     publisher = {mathdoc},
     volume = {84},
     number = {1},
     year = {2000},
     doi = {10.4064/cm-84/85-1-173-183},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-84/85-1-173-183/}
}