A sinh transformation for evaluating nearly singular boundary element integrals

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The sinh transformation for evaluating nearly singular boundary element integrals over high-order geometry elements (2013, methodology): “For evaluating an integral of these types, Johnston and Elliott [14] suggested a change of integration variable using a sinh function with the form of x1⁄4 aþb sinht.”
Singular boundary method for modified Helmholtz equations (2014, background): “In boundary element community, several approaches [31,33] have been proposed to overcome this issue.”
Isogeometric boundary element analysis using unstructured T-splines (2013, methodology): “Transformation techniques which reduce the singularity of the integral thus allowing conventional Gauss-Legendre quadrature to be used are also common [99, 100, 101].”
A sinh transformation for evaluating two‐dimensional nearly singular boundary element integrals (2007, background): “In their recent paper [20], Johnston and Elliott introduced a new transformation, based on the sinh function, for evaluating one-dimensional near singular integrals.”