1. H. Schlichting, ‘‘Laminare Strahlausbreitung,’’ Z. Angew. Math. Mech. 13, 260–263 (1933).
2. L. D. Landau, ‘‘On an exact solution of Navier–Stokes equations,’’ Dokl. Akad. Nauk SSSR 43, 299–301 (1944).
3. L. G. Loitsyanskii, ‘‘Propagation of a whirling jet into an infinite space filled with the same fluid,’’ Izv. Akad. Nauk SSSR, Prikl. Mat. Mekh. 17, 3–16 (1953).
4. M. A. Gol’dshtik, Votex Flows (Nauka, Novosibirsk, 1981) [in Russian].
5. R. Naz, ‘‘Conservation laws for laminar axisymmetric jet flows with weak swirl,’’ Applic. Anal., Int. J. 91, 1045–1052 (2012).