TY  - JOUR
AU  - E. C. Zachmanoglou
TI  - Solutions which are flat or Singular on Totally Characteristic Manifolds of first order Partial Differential Equations 
JO  - Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
PY  - 1979
SP  - 149
EP  - 158
VL  - 20
UR  - http://geodesic.mathdoc.fr/item/DEME_1979_20_a13/
LA  - gr
ID  - DEME_1979_20_a13
ER  -