1. Teasdale,A.; Chéry, C.C.; Cook, G. Implementation of ICH Q3D elemental impurities guideline: challenges and opportunities. Pharm. Technol. 2015,39(3)
2. Elemental Impurities: A Virtual Company Perspective. Con-tract Pharma; April-2017. https://www.contractpharma.com/issues/2017-04-
3. Semiquantitative Screening,of Pharmaceutical,Antiviral Drugs,using,the Agilent,7500ce,ICP-MS,in Helium,Collision Mode.; Ap-plication Note.; Rebeca Santamaria-Fernandez.; Sheila Mer-son.; and Ruth,Hearn.; LGC.; Queens Road.; Teddington.; Mid-dlesex.; TW11 0LY,UK.; 2015. . .
4. Implementation,of,ICH,Q3D,Elemental Impurities,Guideline: Challenges,and Opportunities.; PharmTech.com. 2015,39(3). .
5. United States,Pharmacopeia,(USP).;General Chapter,231-Heavy Metals. http://www.usp.org/chemical-medicines/elemental-impurities-updates Accessed on: November 20,2018. .