@article{10_1017_S0017089507004041,
     author = {ASHRAFI, NAHID},
     title = {THE {UNIT} {SUM} {NUMBER} {OF} {SOME} {PROJECTIVE} {MODULES}},
     journal = {Glasgow mathematical journal},
     pages = {71--74},
     year = {2008},
     volume = {50},
     number = {1},
     doi = {10.1017/S0017089507004041},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089507004041/}
}