@article{SEDP_1989-1990____A23_0,
     author = {Maslov, V. P.},
     title = {Asymptotic solutions of equations with slowly varying coefficients},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:21},
     pages = {1--20},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1989-1990},
     mrnumber = {1073196},
     zbl = {0705.35020},
     language = {en},
     url = {http://www.numdam.org/item/SEDP_1989-1990____A23_0/}
}