@inbook{inbookcf22a1e5,
title   = {On high-eccentricity small-amplitude asteroidal librations},
author = {Simula, A. and Ferraz-Mello, Sylvio and Giordano, C.},
year = {1999},
publisher = {Kluwer},
journal   = {The dynamics of small bodies in the solar system : a major key to solar system studies}
}