Ejtemaei, Mahboobeh, Sadighi, Sepehr, Niaei, Aligholi, Rashidzadeh, Mehdi, Salari, Dariush (2022). Investigating the kaolin activation methods in ultrasonic-assisted hydrothermal synthesis of zeolite A. *Journal of applied research in chemisry*, 16(1), 88-101. 10.30495/jacr.2022.1946945.2001