@article{CMUC_2005__46_1_a13,
     author = {Chadli, Mustapha and El Kadiri, Mohamed and Haddad, Sabah},
     title = {Biharmonic morphisms},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {145--159},
     publisher = {mathdoc},
     volume = {46},
     number = {1},
     year = {2005},
     mrnumber = {2175867},
     zbl = {1121.31004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2005__46_1_a13/}
}