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Hajime Nakamura, Genshi bukkyō no shiso, 2 vols., Tokyo, 1970-71; André Bareau, Recherches sur la biographie du Buddha dans les Sütrapiṭaka et les Vinayapiṭaka anciens: de la quête de l'éveil à la conversion de Sariputra et de Maudgalyayana. Paris, 1963.
Lambert Schmithausen, 'On Some Aspects of Descriptions or Theories of "Liberating Insight" and "Enlightenment" in Early Buddhism', Studien zum Jainismus und Buddhismus. Gedenkschrift für Ludwig Alsdorf (Wiesbaden, 1981), pp. 199-250.
Tilmann Vetter, 'Recent Research on the Most Ancient Form of Buddhism. A Possible Approach and its Results', Buddhism and Its Relations to Other Religions: Essays in Honour of Dr. Shōzen Kumoi on His Seventieth Birthday (Kyoto, 1985), pp. 67-85; The Ideas and Meditative Practices of Early Buddhism. Leiden, 1989.
Noritoshi Aramaki, 'A Text-stratum-analytical Interpretation of the Concept Pañcaskandhas', Jimbun. College of Liberal Arts. Kyoto University 26 (1980), pp. 1-35. The following articles are known to me only from bibliographical references: 'Suttanipata Aṭṭhakavagga ni mirareru ronsō hihan ni tsuite', Nakagawa Zenkyo sensei shōtokukinenronshu (Kyōto, 1983), pp. 117-146; 'Genshi bukkyō kyöten no seiritsu ni tsuite', Tōyō gakujutsu kenkyu 23, 1 (1984), pp. 52-67; 'Attadandasutta (Sn 935-954) wa "Shakuson no kotoba" de arieru ka', Nippon bukkyō gakkai nenpo 50 (1985), pp. (1)-(18); 'On the formation of a short prose Pratītyasamutpada Sūtra', Buddhism and Its Relation to Other Religions: Essays in Honour of Dr. Shōzen Kumoi on His Seventieth Birthday (Kyoto, 1985), pp. 87-121.
Johannes Bronkhorst, The Two Traditions of Meditation in Ancient India. Stuttgart, 1986.
Konrad Meisig, Das Śramanyaphala-sutra. Synoptische Übersetzungen und Glossar der chinesischen Fassungen verglichen mit dem Sanskrit und Pāli. Wiesbaden, 1987. Cf. Paul J. Griffiths, JAOS 109 (1989), pp. (34)