Influence of temperature gradients on structural perfection of single-crystal sillenite fibers grown by the lhpg method - Prokofiev, V V; Andreeta, José Pedro; Lima, C J; Andreeta, M R B; Hernandes, Antônio Carlos; Carvalho, J F; Kamshilin, A A; Jaaskelainen, T (Optical Materials, 1995)