On the ψ -dichotomy for homogeneous linear differential equations. Boi, Pham Ngoc — 2006 Electronic Journal of Differential Equations (EJDE) [electronic only]
Existence of ψ -bounded solutions for nonhomogeneous linear differential equations. Boi, Pham Ngoc — 2007 Electronic Journal of Differential Equations (EJDE) [electronic only]
Behavior at infinity of psi-evanescent solutions to linear differential equations. Boi, Pham Ngoc — 2010 Electronic Journal of Differential Equations (EJDE) [electronic only]