Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Sadao Kanaya and Ling Qi,The concavity of the value function of the extended Barro–Becker model,Journal of Economic Dynamics and Control,0165-1889,Elsevier BV,2010-03-01,34,,314-329,https://cir.nii.ac.jp/crid/1870583643090801920,https://doi.org/10.1016/j.jedc.2009.09.008