@article{10_4064_sm_59_3_301_306,
     author = {K. F\"orster and E. Liebetrau},
     title = {On {semi-Fredholm} operators and the conjugate of a product of operators},
     journal = {Studia Mathematica},
     pages = {301--306},
     publisher = {mathdoc},
     volume = {59},
     number = {3},
     year = {1976},
     doi = {10.4064/sm-59-3-301-306},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-59-3-301-306/}
}