@article{10_4171_dm_573,
     author = {Laiachi El Kaoutit and Niels Kowalzig},
     title = {Morita {Theory} for {Hopf} {Algebroids,} {Principal} {Bibundles,} and {Weak} {Equivalences}},
     journal = {Documenta mathematica},
     pages = {551--609},
     year = {2017},
     volume = {22},
     doi = {10.4171/dm/573},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/573/}
}