Zakariya A. Hussein, Asaad H. Ismail, Ammar A. Battawy, Hawbash Hamadamin Karim, and Jahfer Majeed Ismail, “Indoor radon levels in apartments of Erbil city by using long and short term techniques”, Tikrit J. Pure Sci., vol. 21, no. 3, pp. 150–154, Feb. 2023.