@article{10_4064_sm216_1_6,
     author = {Dumitru Popa},
     title = {2-summing multiplication operators},
     journal = {Studia Mathematica},
     pages = {77--96},
     year = {2013},
     volume = {216},
     number = {1},
     doi = {10.4064/sm216-1-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm216-1-6/}
}