@article{Tan_2005,
    doi = {10.1109/tcad.2005.850812},
    url = {https://doi.org/10.1109%2Ftcad.2005.850812},
    year = {2005},
    month = {aug},
    publisher = {Institute of Electrical and Electronics Engineers ({IEEE})},
    volume = {24},
    number = {8},
    pages = {1241--1250},
    author = {S.X.-D. Tan and  Weikun Guo and  Zhenyu Qi},
    title = {Hierarchical approach to exact symbolic analysis of large analog circuits},
    journal = {{IEEE} Transactions on Computer-Aided Design of Integrated Circuits and Systems}
}

@article{Tan_2005, doi = {10.1109/tcad.2005.850812}, url = {https://doi.org/10.1109%2Ftcad.2005.850812}, year = {2005}, month = {aug}, publisher = {Institute of Electrical and Electronics Engineers ({IEEE})}, volume = {24}, number = {8}, pages = {1241--1250}, author = {S.X.-D. Tan and Weikun Guo and Zhenyu Qi}, title = {Hierarchical approach to exact symbolic analysis of large analog circuits}, journal = {{IEEE} Transactions on Computer-Aided Design of Integrated Circuits and Systems} }