@ARTICLE{
author={Simonovic Nenad S,Salas JP},
year={2001},
title={Hydrogen atom in the instantaneous van der Waals potential: Pitchfork bifurcation and ro-vibrational structure of the energy spectrum},
journal={PHYSICS LETTERS A},
volume={279},
number={5-6},
pages={379-384},
document_type={Article},
} 

@ARTICLE{
author={Salas JP,Simonovic Nenad S},
year={2000},
title={Rydberg states of the hydrogen atom in the instantaneous van der Waals potential: quantum mechanical, classical and semiclassical treatment},
journal={JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS},
volume={33},
number={3},
pages={291-302},
document_type={Article},
}