Authors Amanda Fernández-Fontelo, Manuel Higueras, Elizabeth A Ainsbury, and Pedro Puig Year of Publication 2018 Publisher Radiation Protection Dosimetry Volume 179 Issue 4 Pagination 317-326 DOI https://doi.org/10.1093/rpd/ncx285 ← Probability estimation of a Carrington-like geomagnetic storm → What does a zero mean? Understanding false, random and structural zeros in ecology