Choong, Peter F M, Helena Willen, Mef Nilbert, Fredrik Mertens, Nils Mandahl, Birgitta Carlen, and Anders Rydholm. 1995. “Pigmented Villonodular Synovitis: Monoclonality and metastasis—a Case for Neoplastic Origin?”. Acta Orthopaedica 66 (1):64-68. https://doi.org/10.3109/17453679508994643.