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source: https://www.researchgate.net/publication/355567977_A_new_crack_spacing_model_for_reinforced_concrete_specimens_with_multiple_bars_subjected_to_axial_tension_using_3D_nonlinear_FEM_simulations/fulltext/6176fd4fa767a03c14b1d78c/A-new-crack-spacing-model-for-reinforced-concrete-specimens-with-multiple-bars-subjected-to-axial-tension-using-3D-nonlinear-FEM-simulations.pdf