@article{CRMATH_2007__344_4_247_0,
     author = {Behrend, Kai and Ginot, Gr\'egory and Noohi, Behrang and Xu, Ping},
     title = {String topology for loop stacks},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {247--252},
     publisher = {Elsevier},
     volume = {344},
     number = {4},
     year = {2007},
     doi = {10.1016/j.crma.2006.10.006},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2006.10.006/}
}