Bo Kågström Axel Ruhe Algorithm 560: JNF, An Algorithm for Numerical Computation of the Jordan Normal Form of a Complex Matrix [F2]. 437-443 1980 6 ACM Trans. Math. Softw. 3 http://doi.acm.org/10.1145/355900.355917 db/journals/toms/toms6.html#KagstromR80a