On the solvability of closest point projection procedures in contact analysis: Analysis and solution strategy for surfaces of arbitrary geometry

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Segment-based vs. element-based integration for mortar methods in computational contact mechanics (2015, unknown): “[19] for a comprehensive review.”
Applying Nagata patches to smooth discretized surfaces used in 3D frictional contact problems (2014, methodology): “Then, the application of the orthogonal projection algorithm [34,61] allows calculating both the reference position and the signed normal distance d by solving the following system of equations:”