References
- Pizarro, K. and Jones, M. L. (1992) Crown inclination relapse with multiflex retainers, Journal of Clinical Orthodontics, 26, 780–782.
- Zachrisson, B. U. (1995) Third-generation mandibular bonded lingual 3–3 retainer, Journal of Clinical Orthodontics, 29, 39–48.