Existence of strong solutions of fully nonlinear elliptic equations. - Adriana Buica (Analysis and Optimization of Differential Systems, 2002)

Bifurcation of Limit Cycles from a Four-Dimensional Center in Control Systems. - Adriana Buica; Jaume Llibre (Int. J. Bifurc. Chaos, 2005)

Asymptotic Stability of Periodic Solutions for Nonsmooth Differential Equations with Application to the Nonsmooth van der Pol Oscillator. - Adriana Buica; Jaume Llibre; Oleg Makarenkov (SIAM J. Math. Anal., 2009)