@article{701430,
     title = {Vadim Knizhnik [obituary]},
     booktitle = {Proceedings of the Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1989},
     pages = {[9]-[10]},
     url = {http://dml.mathdoc.fr/item/701430}
}

Feigin, B.; Schechtman, V. Vadim Knizhnik [obituary], dans Proceedings of the Winter School "Geometry and Physics", GDML_Books,  (1989), pp. [9]-[10]. http://gdmltest.u-ga.fr/item/701430/