@article{GDZPPN002234432, title = {Some condensation theorems for semigroup operators.}, journal = {Manuscripta mathematica}, volume = {79}, year = {1993}, pages = {435-446}, zbl = {0798.47033}, url = {http://dml.mathdoc.fr/item/GDZPPN002234432} }
Davydov, Oleg V. Some condensation theorems for semigroup operators.. Manuscripta mathematica, Tome 79 (1993) pp. 435-446. http://gdmltest.u-ga.fr/item/GDZPPN002234432/