Suharyo Hadisaputro, Sagita Yudha, Jeffri Ardiyanto, Rini Indrati, Donny Kristanto Mulyantoro, and Siti Masrochah, “Benefits of steeping black tea as a negative contrast medium on CT urography examination”, ijamscr, vol. 8, no. 3, pp. 647–650, Oct. 2020.