Butkus, M., L. Dargenytė-Kacilevičienė, K. Matuzevičiūtė, D. Ruplienė, and J. Šeputienė. “Simultaneous, Endogenous, and Bi-Directional Relationship Between Output, Labour Productivity, and Employment: A 3SLS Estimation of the Employment Version of Okun Equation”. Journal of Business Economics and Management, vol. 25, no. 5, Oct. 2024, pp. 1030–1051, doi:10.3846/jbem.2024.22425.