Ellianawati, E., Arravi, M., Wulandari, F., & Istiqomah, R. (2018). Determining Hair Thickness using the Light Diffraction Method: Verification of the Seven Times Sliced Hair Phenomenon. Journal of Natural Sciences and Mathematics Research, 4(2), 69-73. doi:https://doi.org/10.21580/jnsmr.2018.4.2.11037