Luo, Yuzhou, Zhaoyan Hu, și Kaijun Yu. „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 (iunie 30, 2018): 187–197. Data accesării noiembrie 7, 2026. https://www.rcis.ro/journal/article/view/2438-the-impact-of-the-rad-expenditure-and-patent-rights.