J Thiele, HM Kvasnicka, R Zankovich, and V Diehl. 2001. “The Value of Bone Marrow Histology in Differentiating Between Early Stage Polycythemia Vera and Secondary (reactive) Polycythemias”. Haematologica 86 (4). Pavia, Italy, 368-74. https://haematologica.org/article/view/1989.