@article{10_1017_S0017089519000065,
     author = {NYSTEDT, PATRIK and \"OINERT, JOHAN and PINEDO, H\'ECTOR},
     title = {EPSILON-STRONGLY {GROUPOID-GRADED} {RINGS,} {THE} {PICARD} {INVERSE} {CATEGORY} {AND} {COHOMOLOGY}},
     journal = {Glasgow mathematical journal},
     pages = {233--259},
     year = {2020},
     volume = {62},
     number = {1},
     doi = {10.1017/S0017089519000065},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089519000065/}
}