Geodesic
Gas-dynamic helical motions with pressure and density depending on time alone
Matematičeskie zametki, Tome 59 (1996) no. 1, pp. 133-141.

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For the submodel of helical motions invariant with respect to the sum of rotation and translation, we consider solutions with pressure and density depending on time alone. Consistency of the system is studied by proceeding to Lagrangian variables. Equivalence of solutions is determined in terms of the five-dimensional admissible group. All solutions of the form described are calculated to within equivalence. 
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     title = {Gas-dynamic helical motions with pressure and density depending on time alone},
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S. V. Khabirov. Gas-dynamic helical motions with pressure and density depending on time alone. Matematičeskie zametki, Tome 59 (1996) no. 1, pp. 133-141. http://geodesic.mathdoc.fr/item/MZM_1996_59_1_a11/

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