KudaybergenovК., MusakulovaМ., OngarbayevЕ., and Z. Mansurov. “Sorbents from Agricultural Wastes for Utilization of the Crude Oil at Accident Spills on Water Area”. Chemical Bulletin of Kazakh National University, Vol. 61, no. 1, Mar. 2011, pp. 141-7, https://bulletin.chemistry.kz/index.php/kaznu/article/view/873.