Persistence of a two-dimensional topological insulator state in wide 'HG''TE' quantum wells - Olshanetsky, E. B.; Kvon, Z. D.; Mikhailov, N. N.; Dvoretsky, S. A.; Raichev, O. E.; Levine, Alexandre; Gusev, Guennadii Michailovich (PHYSICAL REVIEW LETTERS, 2015)