@article{ Solr-acta14544, title = {On nonorthogonal decompositions of certain contractions}, series = {Acta scientiarum mathematicarum}, author = {Pei-Yuan Wu}, year = {1975}, url = {http://acta.bibl.u-szeged.hu/14544/1/math_037_fasc_003_004_301-306.pdf} }