@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}, publisher = {Seminario Matematico of the University of Padua}, volume = {96}, year = {1996}, mrnumber = {1438299}, zbl = {0873.35016}, language = {en}, url = {http://www.numdam.org/item/RSMUP_1996__96__205_0/} }