Updated July 7, 2015, with two additions.
The late Kamaleswar Bhattacharya (died 2014) continued to write on the theme of Ātman-Brahman in ancient Buddhism throughout his life, in various articles. These articles were published in sources that are not easily accessible, being found only in the largest academic libraries. Having visited some of these libraries and made photocopies of these articles, scans of them are now posted here.
A brief biography of Kamaleswar Bhattacharya was included in the Introduction by Phyllis Granoff to a special issue of Journal of Indian Philosophy (vol. 27, nos. 1/2, Feb./Apr. 1999), “Guruvandana: Essays in Indology in Honour of K. Bhattacharya.” It was followed by a Bibliography of his writings. These are posted here as: bhattacharya_kamaleswar_biography_and_bibliography_1999
“On the Brahman in Buddhist Literature.” Sri Venkateswara University Oriental Journal, vol. 18, pts. 1 and 2, Jan.-Dec. 1975, pp. 1-8: brahman_in_buddhist_literature_k_bhattacharya_1975
“The Ātman in Two Prajñāpāramitā-Sūtra-s.” Our Heritage, Special Number: 150th Anniversary Volume, 1824-1974. Calcutta: Sanskrit College, 1979, pp. 39-45: atman_in_two_prajnaparamita-sutras_k_bhattacharya_1979
“Diṭṭhaṃ, Sutaṃ, Mutaṃ, Vinnātaṃ” [sic for Viññātaṃ]. In Buddhist Studies in Honour of Walpola Rahula, ed. Somaratna Balasooriya, et al. London: Gordon Fraser, 1980, pp. 10-15 [On a passage from the Alagaddūpama–sutta.]: dittham_sutam_mutam_vinnatam_k_bhattacharya_1980
“The Anātman Concept in Buddhism.” Navonmeṣa: Mahamahopadhyaya Gopinath Kaviraj Commemoration Volume, vol. 4: English. Varanasi: M. M. Gopinath Kaviraj Centenary Celebration Committee, 1987, pp. 213-224: anatman_concept_in_buddhism_k_bhattacharya_1987
“Brahman in the Pali Canon and in the Pali Commentaries.” Amalā Prajñā: Aspects of Buddhist Studies, Professor P. V. Bapat Felicitation Volume, ed. N. H. Samtani. Bibliotheca Indo-Buddhica, no. 63. Delhi: Sri Satguru Publications, 1989, pp. 15-31: brahman_in_the_pali_canon_k_bhattacharya_1989
“Some Thoughts on Ātman-Brahman in Early Buddhism.” Dr. B. M. Barua Birth Centenary Commemoration Volume, 1989. Calcutta: Bauddha Dharmankur Sabha, 1989, pp. 63-83: atman-brahman_in_early_buddhism_k_bhattacharya_1989
“A Note on Anātman in the Work of E. Lamotte.” Premier Colloque Etienne Lamotte (Bruxelles et Liege 24-27 septembre 1989). Publications de L’Institut Orientaliste de Louvain, 42. Louvain-la-Neuve: Institut Orientaliste, Universite Catholique de Louvain, 1993, pp. 25-26: anatman_in_the_work_of_e_lamotte_k_bhattacharya_1993
“A Note on the Anatta Passage of the Mahānidāna-sutta.” Recent Researches in Buddhist Studies: Essays in Honour of Professor Y. Karunadasa, ed. Kuala Lumpur Dhammajoti, et al. Colombo: Y. Karunadasa Felicitation Committee, 1997, pp. 47-50: anatta_passage_of_the_mahanidana-sutta_k_bhattacharya_1997
“Once More on a Passage of the Alagaddūpama-sutta.” In Bauddhavidyāsudhākaraḥ: Studies in Honour of Heinz Bechert on the Occasion of His 65th Birthday, ed. Petra Kieffer-Pülz and Jens-Uwe Hartmann. Indica et Tibetica, vol. 30. Swisttal-Odendorf: Indica et Tibetica Verlag, 1997, pp. 25-28: alagaddupama-sutta_once_more_on_a_passage_k_bhattacharya_1997
Some Thoughts on Early Buddhism, with Special Reference to Its Relation to the Upaniṣads. Pune: Bhandarkar Oriental Research Institute, 1998. Acharya Dharmananda Kosambi Memorial Lectures (third series). [A 31-page booklet.]: some_thoughts_on_early_buddhism_k_bhattacharya_1998
“Once More on Two Passages of the Pāli Canon.” Indologica Taurinensia, vol. 17-18, 1991-1992 (published 2000), pp. 63-67: pali_canon_once_more_on_two_passages_k_bhattacharya_2000
“Unity in Diversity: Anattā Revisited.” Sanskrit Studies Centre Journal (Silpakorn University, Bangkok, Thailand), vol. 2, 2006, pp. 1-7: anatta_revisited_unity_in_diversity_k_bhattacharya_2006