@article{01354977,
title = {Schallfronten an ebenen Kurven. III. (Sonic wave fronts at plane curves. III).},
journal = {Mathematica Pannonica},
volume = {10},
year = {1999},
pages = {37-47},
zbl = {0924.53006},
language = {en},
url = {http://dml.mathdoc.fr/item/01354977}
}
Suda Karáné, Gizella; Sachs, Hans. Schallfronten an ebenen Kurven. III. (Sonic wave fronts at plane curves. III).. Mathematica Pannonica, Tome 10 (1999) pp. 37-47. http://gdmltest.u-ga.fr/item/01354977/