Nguyen, Q., Nguyen, T., Le, P. and Pham, Q. 2015. Determination of caffeine content and the volatile compound in some products of roasted and instant coffee in Vietnam. Science and Technology Development Journal. 18, 2 (Jun. 2015), 85-93. DOI:https://doi.org/https://doi.org/10.32508/stdj.v18i2.1062.