@article{SIGMA_2021_17_a101,
     author = {Claude LeBrun},
     title = {Twistors, {Self-Duality,} and {Spin}${}^c$ {Structures}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2021},
     volume = {17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a101/}
}