%0 Journal Article %T Connecting Classical and Abstract Theory of Friedrichs Systems via Trace Operator %A Nenad Antonić %A Kreš %A imir Burazin %A Marko Vrdoljak %J ISRN Mathematical Analysis %D 2011 %I Hindawi Publishing Corporation %R 10.5402/2011/469795 %U http://dx.doi.org/10.5402/2011/469795