TY  - BOOK
AU  - Galina Filipuk, Alberto Lastra, S?awomir Michalik
TI  - Formal and Analytic Solutions of Diff. Equations 
SN  - 9783319991481
PB  - Springer
UR  - https://link.springer.com/openurl?genre=book&isbn=978-3-319-99148-1
ER  -