1981. ‘the paṭṭhāna and the development of the theravādin abhidhamma’", journal of the pali text society", 9, pp. 22–46: on how the outlines of the developed theravādin theory of the "citta-vīthi," or the process of perception as a series of specific mind-states, lie in this canonical abhidhamma text: http://www.palitext.com/jpts_scans/jpts_1981_ix.pdf