Masashi Nishihara's 1973 Michigan PhD thesis on Japanese-Indonesian relations 1951-1966: war reparations, the Kishi-Sukarno settlement, lobbies, the Malaysia confrontation and the 'Sukarno groups'. Gerwani appears only once (pp. 285-286): the Nasution-Suharto group's claim that Pemuda Rakyat, Gerwani and SOBSI trained
Hirano Keiko's Japanese article (2005) on the historical formation of 'ibuism', arguing the supposedly priyayi tradition was produced under colonial rule through the conflict over the 1937 monogamous marriage bill. Context on gender ideology and marriage law; Gerwani marginal.
Japanese review (Ajia Keizai, July 2006) by Hattori Mina of Blackburn's Women and the State in Modern Indonesia, with post-1998 context, chapter summaries and evaluation; Gerwani appears only in notes. Context rather than evidence. (In Japanese.)
Kochi Kaoru's 2025 article using second-hand-market documents to show that wives and widows of leftist men, including former Gerwani members, married or became concubines of officers and soldiers, and the army banned the practice; also covers 'bersih diri' certificates and disenfranchisement.