Damayanti, Ayu Anisa, Ni Luh Putu Trisnawati, & Hery Suyanto. " Identification of Betel Leaf Wave Numbers (Piper sp.) Using Fourier Transform Infrared (FTIR) Spectroscopy Methods and Principal Component Analysis (PCA)." BULETIN FISIKA [Online], 22.2 (2021): 60-66. Web. 20 Sep. 2024