@article{10_4064_cm_53_1_17_25,
     author = {Kazimierz Szymiczek},
     title = {Abstract {Grothendieck} rings},
     journal = {Colloquium Mathematicum},
     pages = {17--25},
     publisher = {mathdoc},
     volume = {53},
     number = {1},
     year = {1987},
     doi = {10.4064/cm-53-1-17-25},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-53-1-17-25/}
}