Hendrix, Tommy, Mahardhika Berliandaldo, Eki Karsani Apriliyadi, and Firman Tri Ajie. 2021. “The Impact of Patent Portfolio on Competitive Landscape of Digital Signage Apparatus”. Jurnal Manajemen Teknologi 20 (1):79-97. https://doi.org/10.12695/jmt.2021.20.1.5.