Equivalent polynomials for quadrature in Heaviside function enriched elements

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The p-Version of the Finite Element and Finite Cell Methods (2017, background): “, 2013; Sudhakar and Wall, 2013) or the integrand (Ventura, 2006; Ventura and Benvenuti, 2014) to regain the accuracy of the integration.”
An improved stable XFEM (Is-XFEM) with a novel enrichment function for the computational modeling of cohesive cracks (2015, methodology): “Contrariwise, some strategies have to be introduced to deal with the discontinuous integrands involved in the stiffness matrices K ed , K e d and K e ww ; see the method employing equivalent polynomials [66] and the references therein.”
Extended finite element method in computational fracture mechanics: a retrospective examination (2015, unknown): “…quadrature rules that integrate discontinuous functions on either side of the crack (Ventura 2006; Holdych et al. 2008; Mousavi and Sukumar 2010b; Ventura and Benvenuti 2015); however, these approaches are still the subject of current research, and hence the partitioning procedure continues to…”