RETENTION 803,462 Retention and stability in orthodontics / [ed. by] Ravindra Nanda, Charles J. Burstone ; [contributors Richard G. Alexander et al.]. - Philadelphia [etc.] i W.B. Saunders Co. a Division of Harcourt Brace and Co., cop. 1993. - XII, 227 s. : il., wykr. / 27 cm Bibliogr. przy rozdz. Indeks ISBN 0-7216-4342-6