Geodesic
Complex space-time ray method and ``quasifotons''
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 12, Tome 117 (1981), pp. 5-12

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Pormal asymptotic solutions of wave equation are constructed in a form of concentrated packets of waves, moving along space-time rays. The method of construction, being a generalization of complex ray method in space, is connected with V. P. Maslov technique and based on complex solutions of Hamilton–Jacobi equations. 
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     author = {V. M. Babich and V. V. Ulin},
     title = {Complex space-time ray method and ``quasifotons''},
     journal = {Zapiski Nauchnykh Seminarov POMI},
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     volume = {117},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_117_a0/}
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V. M. Babich; V. V. Ulin. Complex space-time ray method and ``quasifotons''. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 12, Tome 117 (1981), pp. 5-12. http://geodesic.mathdoc.fr/item/ZNSL_1981_117_a0/