@article{ARM_2000_36_3_a6,
     author = {Spigler, Renato and Vianello, Marco},
     title = {A variant of the complex {Liouville-Green} approximation theorem},
     journal = {Archivum mathematicum},
     pages = {213--218},
     year = {2000},
     volume = {36},
     number = {3},
     mrnumber = {1785039},
     zbl = {1058.34128},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2000_36_3_a6/}
}