Li, T., T. Baležentis, L. Cao, J. Zhu, D. Štreimikienė, and R. Melnikienė. “Technical Change Directions of China’s Grain Production: Application of the Bias-Corrected Malmquist Indices”. Technological and Economic Development of Economy, vol. 24, no. 5, Oct. 2018, pp. 2065-82, doi:10.3846/20294913.2017.1352050.