@article{PIM_1987_N_S_41_55_a1,
     author = {Milan Grulovi\'c},
     title = {On {Reduced} {Products} of {Forcing} {Systems}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {17 },
     publisher = {mathdoc},
     volume = {_N_S_41},
     number = {55},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1987_N_S_41_55_a1/}
}