@article{10_21136_AM_1989_104368,
     author = {Gittel, Hans-Peter},
     title = {On some properties of solutions of transonic potential flow problems},
     journal = {Applications of Mathematics},
     pages = {402--416},
     publisher = {mathdoc},
     volume = {34},
     number = {5},
     year = {1989},
     doi = {10.21136/AM.1989.104368},
     mrnumber = {1014081},
     zbl = {0689.76019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1989.104368/}
}