@article{10_1017_S0017089510000364,
     author = {GR{\O}NB{\AE}K, NIELS and HABIBIAN, FEREIDOUN},
     title = {BIFLATNESS {AND} {BIPROJECTIVITY} {OF} {BANACH} {ALGEBRAS} {GRADED} {OVER} {A} {SEMILATTICE}},
     journal = {Glasgow mathematical journal},
     pages = {479--495},
     year = {2010},
     volume = {52},
     number = {3},
     doi = {10.1017/S0017089510000364},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089510000364/}
}