@article{10_4064_fm_134_2_93_104,
     author = {Helga Schirmer},
     title = {A fixed point index for bimaps},
     journal = {Fundamenta Mathematicae},
     pages = {93--104},
     publisher = {mathdoc},
     volume = {134},
     number = {2},
     year = {1990},
     doi = {10.4064/fm-134-2-93-104},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-134-2-93-104/}
}