Functional group, transversal optic and longitudinal optic analysis using kramer-kronig method of mycellium and oyster mushroom in 35, 40, and 45 daysIrzaman, Irlian Nurmaniah, Nazopatul Patonah Har, Renan Prasta Jenie, Ridwan Siskandar, Teguh Puja Negara, Erdiansyah Pratama, Heriyanto Syafutra, Husin Alatas and IrmansyahBIO Web Conf., 171 (2025) 02004DOI: https://doi.org/10.1051/bioconf/202517102004