@article{CMUC_1989__30_4_a23,
     author = {K\^ozaki, Masanori and Sumi, Hidekichi},
     title = {On normal forms of {Laplacian} and its iterations in harmonic spaces},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {795--802},
     publisher = {mathdoc},
     volume = {30},
     number = {4},
     year = {1989},
     mrnumber = {1045912},
     zbl = {0694.53036},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1989__30_4_a23/}
}