1. A little history: the first direct bonding in orthodontia;Cueto;Am J Orthod Dentofac Orthop,1990
2. Bandless orthodontic attachment;Mitchell,1960
3. Bandless orthodontic bracket;Mitchell;J Am Dent Assoc,1967
4. Dental cement: a study of adhesion;Berkson;Am J Orthod,1950
5. Epoxy resins; their applications and technology;Lee,1957