@article{AIHPD_2020__7_4_505_0,
     author = {Nekrasov, Nikita},
     title = {Magnificent four},
     journal = {Annales de l{\textquoteright}Institut Henri Poincar\'e D},
     pages = {505--534},
     volume = {7},
     number = {4},
     year = {2020},
     doi = {10.4171/aihpd/93},
     mrnumber = {4182774},
     zbl = {1454.05016},
     language = {en},
     url = {http://archive.numdam.org/articles/10.4171/aihpd/93/}
}