V P Maslov and M V Fedoriuk 1981 Holland: D Reidel vi + 301 pp price Dfl125 At last this is the English translation of the Soviet work responsible for the last decade's intense interest shown by pure mathematicians in the connections between waves and rays. Maslov's brilliant original contribution has been the conception and detailed working-out of the association between waves and certain phase–space surfaces – ‘Lagrangian manifolds’.
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Michael Berry (1982) studied this question.