Emam, Ismail | Ali, Maha A. Validation of a Simpole Analytical Model for In-air Output Factor Calculation for SL-15 Philips-Elekta Linear Accelerator Istituti Editoriali e Poligrafici Internazionali is_part_of Physica medica : european journal of medical physics : XXI, 2, 2005 usage_policy P23 P23 EUR 15.00 vat_excluded purchase PDF a ar