sudjana, S. “AKIBAT HUKUM PENGHAPUSAN DAN PEMBATALAN MEREK TERDAFTAR TERHADAP HAK ATAS MEREK (Eletion and Cancellation of Registered Marks in The Perspective of Legal Certainty)”. Res Nullius Law Journal, Vol. 2, no. 2, July 2020, pp. 119-40, doi:10.34010/rnlj.v2i2.3076.