Magnetooscillations in a trapezoidal two-dimensional electron gas grown over 'GA''AS' wires - La Scala Junior, N; Gusev, Guennadii Michailovich; Lubyshev, D I; González-Borrero, P P; Silva, Marcelo de Assumpção Pereira da; Rossi, J C; Basmaji, Pierre (Encontro Nacional de Fisica da Materia Condensada, 1996)