@article{EXMATH_1989__4_1_38291,
     author = {M. Gonz\'alez Ortiz},
     title = {Ideal semigroups associated to an operator ideal},
     journal = {Extracta Mathematicae},
     pages = {39},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1989},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/EXMATH_1989__4_1_38291/}
}