@article{marin_garcía_mikhailov_2006,  title={Two electrons in vertically coupled one-dimensional rings},  volume={36},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332006000600038},  DOI={10.1590/S0103-97332006000600038},  number={3b},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Marin, Jairo H. and García, Francisco and Mikhailov, Ilia D.},  year={2006},  month={Sep},  pages={940–943} }