Landau levels in two and three-dimensional electron gases in a wide parabolic quantum well - Sergio, C S; Gusev, Guennadii Michailovich; Leite, J. R.; Olshanetskii, E B; Bykov, A A; Moshegov, N T; Bakarov, A K; Toropov, A I; Maude, D K; Estibals, O; Portal, J C (Brazilian Journal of Physics, 2002)