TY  - RPRT
TI  - The "sandwich" technique.
AU  - Theodore P Croll
PY  - 2004
DO  - 10.1111/j.1708-8240.2004.tb00037.x
UR  - https://pubmed.ncbi.nlm.nih.gov/15672613/
ID  - 15672613
ER  -