@article{ Solr-acta14296, title = {Hyperinvariant subspaces for n-normal operators}, series = {Acta scientiarum mathematicarum}, author = {Hoover Thomas B.}, year = {1971}, url = {http://acta.bibl.u-szeged.hu/14296/1/math_032_fasc_001_002_109-119.pdf} }