Decanniere, P., Debuyst, R., Dejehet, F., & Apers, D. (1988). Electron-spin-resonance Study of Internally Alpha-irradiated (po-210 Nitrate Doped) Calcite Single-crystal. Nuclear Tracks and Radiation Measurements, 14(1-2), 267-273. https://doi.org/10.1016/1359-0189(88)90075-1 (Original work published 1988)