1. Engzell U, Esposti PL, Rubio C, Sigurdson A, Zajicek J (1971) Investigations on tumor spread in connection with aspiration biopsy. Acta Radiol Diagn 10:385–398
2. O’Dwyer P, Farrar WB, James AG, Fenkelmier W, McCabe DP (1986) Needle aspiration biopsy of major salivary gland tumors: its value. Cancer 57:554–557
3. Cohen MB, Reznicek MJ, Miller TR (1992) Fine-needle aspiration biopsy of the salivary glands. Pathol Annu 27:213–245
4. Orell SR, Sterrett GF, Walters MN, Whitaker D (1999) Manual and atlas of fine needle aspiration cytology, 3rd edn. Churchill Livingstone, Edinburgh, pp 1–43
5. Demay RM (1999) Art and science of cytopathology (CD-ROM). American society of clinical pathologist press, Chicago: ASCP