@article{SIGMA_2021_17_a89,
     author = {Nigel J. Hitchin},
     title = {Spinors, {Twistors} and {Classical} {Geometry}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2021},
     volume = {17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a89/}
}