@article{NUMA_1986__49_133111,
     author = {Reinhard Scholz},
     title = {Numerical {Solution} of the {Obstacle} {Problem} by the {Penalty} {Method.} {Part} {II.} {Time-Dependent} {Problem.}},
     journal = {Numerische Mathematik},
     pages = {255--268},
     publisher = {mathdoc},
     volume = {49},
     year = {1986},
     zbl = {0592.65039},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1986__49_133111/}
}