Sulistyawati, Endang, and Robertinus Filustra Siregar Siregar. “Characteristics of Porous Hydroxyapatite from Precursors of Rice Conch Shells and Porogeneous Materials of Breadfruit”. Eksergi, vol. 16, no. 2, Nov. 2019, pp. 59-63, doi:10.31315/e.v16i2.3082.