TY  - BOOK
AU  - Lie,Sophus
TI  - Über Integralinvarianten und Differentialgleichungen
AV  - QA 
PY  - 2008///
PB  - Project Gutenberg
KW  - Differential equations
KW  - Integrals
N1  - Public domain in the USA; Electronic text
UR  - http://www.gutenberg.org/ebooks/25157
ER  -