@article{10_4064_ap_13_1_101_103,
     author = {W. Mlak},
     title = {An example of the equation $u_t = u_{xx} + f(x, t, u)$ with distinct maximum and minimum solutions of a mixed problem},
     journal = {Annales Polonici Mathematici},
     pages = {101--103},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1963},
     doi = {10.4064/ap-13-1-101-103},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-13-1-101-103/}
}