@article{TranKreissigVuetal.2008,
  author    = {Thanh Ngoc Tran and R. Kreißig and Duc Khoi Vu and Manfred Staat},
  title     = {Upper bound limit and shakedown analysis of shells using the exact Ilyushin yield surface},
  journal   = {Computer \& Structures. 86 (2008)},
  pages     = {1683 -- 1695},
  year      = {2008},
}