@article{701581,
     title = {Cohomology and connection on $S1$-bundles},
     booktitle = {Proceedings of the 15th Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1996},
     pages = {[123]-132},
     mrnumber = {MR1463515},
     zbl = {0909.58001},
     url = {http://dml.mathdoc.fr/item/701581}
}

Gross, Christian. Cohomology and connection on $S1$-bundles, dans Proceedings of the 15th Winter School "Geometry and Physics", GDML_Books,  (1996), pp. [123]-132. http://gdmltest.u-ga.fr/item/701581/