Shape derivative of cost function for singular point: Evaluation by the generalized J integral. - Hideyuki Azegami; Kohji Ohtsuka; Masato Kimura (JSIAM Lett., 2014)

Shape Differentiability of Lagrangians and Application to Stokes Problem. - Victor A. Kovtunenko; Kohji Ohtsuka (SIAM J. Control. Optim., 2018)