@article{BSMF_1983__111__449_0,
     author = {Ray, Nigel and Schwartz, Lionel},
     title = {Construction d{\textquoteright}\'el\'ements dans $\pi ^S_*(BU(2))$},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {449--465},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {111},
     year = {1983},
     doi = {10.24033/bsmf.1998},
     mrnumber = {85m:55011},
     zbl = {0547.55011},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1998/}
}