TY  - INPR
A1  - Popivanov, Petăr R.
T1  - Lorenz transformations and creation of logarithmic singularities to the solutions of some nonstrictly hyperbolic semilinear systems with two space variables
T3  - Preprint - (2004) 07 
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-26710
ER  -