@article{MZ_1977__153_172495,
     author = {Wolfgang Walter and Ray. Redheffer},
     title = {Counterexamples for {Parabolic} {Differential} {Equations.}},
     journal = {Mathematische Zeitschrift},
     pages = {229--236},
     publisher = {mathdoc},
     volume = {153},
     year = {1977},
     zbl = {0331.35033},
     url = {http://geodesic.mathdoc.fr/item/MZ_1977__153_172495/}
}