@article{SJL_1973-1974___3_1_0,
     author = {Leray, Jean},
     title = {Solutions asymptotiques et groupe symplectique},
     journal = {S\'eminaire Jean Leray},
     pages = {1--25},
     publisher = {Coll\`ege de France},
     number = {3},
     year = {1973-1974},
     language = {fr},
     url = {http://www.numdam.org/item/SJL_1973-1974___3_1_0/}
}