1983–4. ‘"nibbāna" and abhidhamma’, "buddhist studies review", 1(2), pp. 95–109: an exploration of "nibbāna" in the "nikāya"s and then how the abhidhamma systems shared in seeing it as an atemporal, non-spatial unconditioned reality that was neither mind, in the usual sense, nor material: http://ukabs.org.uk/buddhist-studies-review-vols-1-22/