@article{CMUC_1992_33_2_a9,
     author = {Smyrnelis, Emmanuel P.},
     title = {Harnack's properties of biharmonic functions},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {299--302},
     year = {1992},
     volume = {33},
     number = {2},
     mrnumber = {1189660},
     zbl = {0754.31006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1992_33_2_a9/}
}