@article{IJAMCS_2006_16_1_a11,
     author = {Hnatkowska, B. and Huzar, Z. and Tuzinkiewicz, L.},
     title = {Refinement of {UML} collaborations},
     journal = {International Journal of Applied Mathematics and Computer Science},
     pages = {155--164},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IJAMCS_2006_16_1_a11/}
}