M. E. Ahmed, I. Ahmad, and S. Akhtar, “ULTRASOUND GUIDED FINE NEEDLE ASPIRATION CYTOLOGY VERSUS CORE BIOPSY IN THE PREOPERATIVE ASSESSMENT OF NON-PALPABLE BREAST LESIONS”, J Ayub Med Coll Abbottabad, vol. 22, no. 2, pp. 138–142, Jun. 2010.