Anamika Choubey, Sunita Sahu, R. D. A. K. “A Highly Sensitive Method for the Determination of Chlorpyrifos in Vegetable and Water Samples at Abhanpur Area”. Design Engineering, Sept. 2021, pp. 14594-02, http://www.thedesignengineering.com/index.php/DE/article/view/4743.