et. al., Han-Hsing Yu,. “Research on the R&Amp;D Efficiency Based on the Three-Stage Dea Index-Taking the High-Tech Industry As an Example”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 11 (May 10, 2021): 4172–4183. Accessed May 5, 2024. https://turcomat.org/index.php/turkbilmat/article/view/6545.