Samkov, A., Suslova, G., Litvinenko, V., & Zakharchenko, Y. (2011). Project management of aeronautical system upgrade in uncertain conditions / Aeronautikos sistemų atnaujinimo projektų valdymas nepastoviomis sąlygomis. Aviation, 15(3), 69-75. https://doi.org/10.3846/16487788.2011.625148