Luo, Yuzhou, Zhaoyan Hu, and Kaijun Yu. 2018. “The Impact of the R&D Expenditure and Patent Rights towards Operating Performance in Medical Device Industry – An Empirical Study”. Revista de Cercetare Si Interventie Sociala 61 (June): 187-97. https://www.rcis.ro/journal/article/view/2438-the-impact-of-the-rad-expenditure-and-patent-rights.