Geodesic
On the geometry of the characteristic cones of a mapping of $P_m$ into $P_n$ when $m>n$
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1974), pp. 81-86.

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     author = {M. V. Dragnev and V. V. Ryzhkov},
     title = {On the geometry of the characteristic cones of a mapping of $P_m$ into $P_n$ when $m>n$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {81--86},
     publisher = {mathdoc},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1974_5_a9/}
}
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M. V. Dragnev; V. V. Ryzhkov. On the geometry of the characteristic cones of a mapping of $P_m$ into $P_n$ when $m>n$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1974), pp. 81-86. http://geodesic.mathdoc.fr/item/IVM_1974_5_a9/