@PhdthesisMisc{H56_958,
author = {Hans Rudolf Schwarz},
title = {Ein Verfahren zur Stabilit\"atsfrage bei Matrizen-Eigenwertproblemen},
note = {Dis_no 2603, Prof. Dr. Eduard Stiefel},
school = {ETH Z{\"u}rich},
doi = {http://dx.doi.org/10.3929/ethz-a-000091928},
year = {1956}
}