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The 3 references without a DOI — listed, not checked
no DOI — not checkedJan, K. M., Hong, C. C., Wu, T. H., Wang, Y. M., & Lan, Y. P. (2003). Patent map and analysis of titanium dioxide or titanium oxide. Science and Technology Information Center, National Science Council, Taiwan, STIC-RPR-092-04 (Chinese).
no DOI — not checkedLi, Q., Takanishi, A., & Kato, I. (1991). A biped walking robot having a ZMP measurement system using universal force-moment sensors. In Proceedings of IEEE/RSJ international workshop on intelligent robots and systems IROS’91 (pp. 1568–1573).
no DOI — not checkedMai, F., Huang, F. T., Jan, K. M., Wang, Y. M., & Chen, C. Y. (2002). Patent map and analysis of carbon nanotube. Science and Technology Information Center, National Science Council, Taiwan, STIC-RPR-091-07 (Chinese).
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