Novel trion states in low-density -hole system with complex valence band structureO. V. Volkov, M. Pohlt, I. V. Kukushkin, W. Dietsche and K. v. KlitzingEurophys. Lett., 50 3 (2000) 409-415DOI: https://doi.org/10.1209/epl/i2000-00284-x