@article{10_4064_ap_15_3_273_287,
     author = {R. P. Gilbert},
     title = {Harmonic functions in four variables with rational and algebraic $p_4$-associates},
     journal = {Annales Polonici Mathematici},
     pages = {273--287},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1964},
     doi = {10.4064/ap-15-3-273-287},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-15-3-273-287/}
}