@article{SIGMA_2020_16_a126,
     author = {Rudolf Zeidler},
     title = {Width, {Largeness} and {Index} {Theory}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2020},
     volume = {16},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2020_16_a126/}
}