Lev Vasil’yevich Ovsyannikov (On the occasion of his 90th birthday). (Russian, English) Zbl 1199.01029 Prikl. Mat. Mekh. 73, No. 3, 339-352 (2009); translation in J. Appl. Math. Mech. 73, No. 3, 245-248 (2009). MSC: 01A70 Biographies, obituaries, personalia, bibliographies 35A99 General topics in partial differential equations 76N15 Gas dynamics (general theory) 76A99 Foundations, constitutive equations, rheology, hydrodynamical models of non-fluid phenomena Keywords:group analysis; gas dynamics; hydrodynamics with free boundary Biographic References: Ovsyannikov, Lev Vasil’yevich PDFBibTeX XMLCite Prikl. Mat. Mekh. 73, No. 3, 339--352 (2009; Zbl 1199.01029); translation in J. Appl. Math. Mech. 73, No. 3, 245--248 (2009)