LEWIŃSKI, J., MAGNUCKA-BLANDZI, E. and SZYC, W. (2015) “Shear Modulus of Elasticity for Thin-Walled Trapezoidal Corrugated Cores of Seven-Layer Sandwich Plates”, Engineering Transactions, 63(4), pp. 421–438. doi:10.24423/engtrans.309.2015.