Rizky Reynaldy Brahmana, Mochamad Tutuk Safirin. Smart door lock design and development using the pahl and beitz approach. Int. J. Ind. Optim. [Internet]. 2025Oct.1 [cited 2025Dec.5];6(2):182-94. Available from: http://journal2.uad.ac.id/index.php/ijio/article/view/12892