@inbook{inbook524ed996,
title   = {The application of energy conservation Hamilton's principle to the determination of energy efficiency in SPT tests},
author = {Aoki, Nelson and Cintra, José Carlos A},
year = {2009},
publisher = {EESC-USP},
journal   = {Engenharia de fundações - passado recente e perspectivas : homenagem ao Prof. Nelson Aoki}
}