A. Droujinine, J. Pajchel and K. Hitchen 2008. A study of sub-basalt depth imaging using the local Radon attributes on the Erlend Tertiary volcanic complex - North of Shetland, UK. Netherlands Journal of Geosciences. 87, (Aug. 2008), 135 - 149. DOI:https://doi.org/10.1017/S0016774600023180.