@book{ BA28924553,
  author    = "Marchuk, Guriĭ Ivanovich and Agoshkov, V. I. (Valeriĭ Ivanovich) and Shuti︠a︡ev, V. P. (Vykmor Pemrovich)",
  title     = "Adjoint equations and perturbation algorithms in nonlinear problems",
  publisher = "CRC Press",
  year      = "1996",
  URL       = "https://ci.nii.ac.jp/ncid/BA28924553"
}