Spanov, M. U., Z. Z. Yeszhanova, and A. S. Ussenova. “Evaluation of Human Capital Using the Example of the Chemical and Petrochemical Industry of the Republic of Kazakhstan Using the Cobb-Douglas Production Function”. Journal of Economic Research &Amp; Business Administration, vol. 145, no. 3, Sept. 2023, pp. 103-21, doi:10.26577/be.2023.v145.i3.010.