@article{RSMUP_1996__96__205_0,
     author = {Boiti, Chiara and Nacinovich, Mauro},
     title = {Extension of formal power series solutions},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {205--235},
     year = {1996},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {96},
     mrnumber = {1438299},
     zbl = {0873.35016},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1996__96__205_0/}
}