1.
Spira Y, Lackner R, Pichler C, Mang H. Viscoplastic material models for soil: new insight into the soil-support interaction in NATM tunnel excavations. Arch. Mech. 2005;57(2-3):209-240. Accessed January 17, 2026. http://am.ippt.gov.pl/index.php/am/article/view/v57p209