@article{10_4064_am32_4_5,
     author = {Mircea Sofonea and Youssef Ouafik},
     title = {A piezoelectric contact problem
 with normal compliance},
     journal = {Applicationes Mathematicae},
     pages = {425--442},
     publisher = {mathdoc},
     volume = {32},
     number = {4},
     year = {2005},
     doi = {10.4064/am32-4-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am32-4-5/}
}