S. L. Lesik, “Attractor of a Nonautonomous Hyperbolic Equation with a Small Parameter”, Mat. Zametki, 72:6 (2002), 945–948; Math. Notes, 72:6 (2002), 868–871
2000
2.
S. L. Lesik, “Attractor of nonautonomous hyperbolic equation with small parameter”, Mat. Zametki, 67:2 (2000), 308–311; Math. Notes, 67:2 (2000), 252–255
