@article{MS2_1968__22_166026,
     author = {P. Ribenboim and G. Sorani},
     title = {Cohomology and {Homology} of {Pairs} of {Preshaves.}},
     journal = {Mathematica Scandinavica},
     pages = {5--16},
     publisher = {mathdoc},
     volume = {22},
     year = {1968},
     zbl = {0182.25802},
     url = {http://geodesic.mathdoc.fr/item/MS2_1968__22_166026/}
}