1. Nonhematopoietic mesenchymal stem cells: what are they?;Horwitz;Cytotherapy,2000
2. Heterotopic of bone marrow;Friedenstein;Transplantation,1968
3. Precursors for fibroblasts in different populations of hematopoietic cells as detected by the in vitro colony assay method;Friedenstein;Exp Hematol,1974
4. Stromal stem cells: marrow-derived osteogenic precursors;Owen;Ciba Found Symp,1988
5. Mesenchymal stem cells;Caplan;J Orthop Res,1991