Rectangular potentials in a semi-harmonic background: spectrum, resonances and dwell time. Fernández-García, Nicolás, Rosas-Ortiz, Oscar (2011) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Riccati and Ermakov equations in time-dependent and time-independent quantum systems. Schuch, Dieter (2008) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]