In vitro bone sialoprotein-I expression in combined gingival stromal cells and platelet rich fibrin during osteogenic differentiation - Nugraha, Alexander Patera; Narmada, Ida Bagus; Ernawati, Diah Savitri; Dinaryanti, Aristika; Hendrianto, Eryk; Ihsan, Igo Syaiful; Riawan, Wibi; Rantam, Fedik Abdul (Tropical journal of pharmaceutical research, 2019)