@article{NUMA_1966__9_131721,
     author = {H.P.M. van KEMPEN},
     title = {On the {Convergence} of the {Classical} {Jacobi} {Method} for {Real} {Symmetric} {Matrices} with {Non-Distinct} {Eigenvalues.}},
     journal = {Numerische Mathematik},
     pages = {11--18},
     publisher = {mathdoc},
     volume = {9},
     year = {1966},
     zbl = {0229.65037},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1966__9_131721/}
}