Conjugate gradient-boundary element solution to the Cauchy problem for Helmholtz-type equations

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The method of fundamental solutions for the Cauchy problem associated with two-dimensional Helmholtz-type equations (2005, unknown): “[32,33] have solved the Cauchy problem for Helmholtztype equations by employing the BEM in conjunction with an alternating iterative algorithm and the conjugate gradient method, respectively.”
Comparison of regularization methods for solving the Cauchy problem associated with the Helmholtz equation (2004, methodology): “[14, 15] have solved the Cauchy problem associated to the Helmholtz equation using the BEM in conjunction with an alternating iterative procedure consisting of obtaining successive solutions to well-posed mixed boundary value problems and with the conjugate gradient method (CGM), respectively.”
Two regularization methods for the Cauchy problems of the Helmholtz equation (2010, methodology): “Several numerical methods have been proposed to solve this problem, such as the boundary element method (BEM) [14], the conjugate gradient method [4,16], the Landweber method [15], the singular value decomposition (SVD) method [16], the method of fundamental solutions (MFS) [13,17,18], the boundary ”
BEM solution for the Cauchy problem associated with Helmholtz-type equations by the Landweber method (2004, methodology): “A BEM with constant boundary elements [15,16] is used in order to discretise the problem given by Eqs.”