Horner A, Bord S, Kemp P, Grainger D, Compston JE. Distribution of platelet-derived growth factor (PDGF) A chain mRNA, protein, and PDGF-alpha receptor in rapidly forming human bone. Bone. 1996 Oct;19(4):353–62. doi: 10.1016/s8756-3282(96)00217-7. PMID: 8894141.