@article{10_4064_ap_33_2_219_221,
     author = {Shigeru Haruki},
     title = {Four different unknown functions satisfying the triangle mean value property for harmonic polynomials},
     journal = {Annales Polonici Mathematici},
     pages = {219--221},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {1976},
     doi = {10.4064/ap-33-2-219-221},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-33-2-219-221/}
}