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title = {{Achieving Chemical Accuracy with Coupled-Cluster Theory}},  booktitle = {Quantum Mechanical Electronic Structure Calculations with Chemical Accuracy},  }  @article{Helgaker_2004,  doi = {10.1002/poc.841},  url = {http://dx.doi.org/10.1002/poc.841},  year = {2004},  month = {oct},  publisher = {Wiley-Blackwell},  volume = {17},  number = {11},  pages = {913--933},  author = {Trygve Helgaker and Torgeir A. Ruden and Poul J{\o}rgensen and Jeppe Olsen and Wim Klopper},  title = {{Apriori calculation of molecular properties to chemical accuracy}},  journal = {Journal of Physical Organic Chemistry},  }