@article{TSG_1988-1989__7__103_0,
     author = {Guillop\'e, Laurent},
     title = {Introduction \`a l{\textquoteright}invariant $\eta $},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {103--114},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {7},
     year = {1988-1989},
     mrnumber = {1046269},
     zbl = {0706.58073},
     language = {fr},
     url = {http://www.numdam.org/item/TSG_1988-1989__7__103_0/}
}