@article{NUMA_1961__3_131477,
     author = {G. KJELLBERG},
     title = {On the successive over-relaxation method for cyclic operators.},
     journal = {Numerische Mathematik},
     pages = {87--91},
     publisher = {mathdoc},
     volume = {3},
     year = {1961},
     zbl = {0096.32303},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1961__3_131477/}
}