@article{NUMA_1991__60_4_133584,
     author = {Houde Han},
     title = {A boundary element method for {Signorini} problems in three dimensions.},
     journal = {Numerische Mathematik},
     pages = {63--76},
     publisher = {mathdoc},
     volume = {60},
     number = {4},
     year = {1991},
     zbl = {0723.65092},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1991__60_4_133584/}
}