Hazliza Ariffin N, Arsad N, Hariz Ahmad A, Bais B, Kamal N, Ab Aziz N, et al. Self-Leveling Laser for Direction Marking System. IJET [Internet]. 2019 Jan. 30 [cited 2024 Apr. 29];8(1.2):214-9. Available from: https://www.sciencepubco.com/index.php/ijet/article/view/24905