@article{10_4064_ap85_3_2,
     author = {Kinga Stolot},
     title = {Coproducts and the additivity of the {Szymczak} index},
     journal = {Annales Polonici Mathematici},
     pages = {211--226},
     publisher = {mathdoc},
     volume = {85},
     number = {3},
     year = {2005},
     doi = {10.4064/ap85-3-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap85-3-2/}
}