@article{harris:2002:aet,
    author = {Frank E. Harris},
     title = {Analytic evaluation of two-center {STO} electron repulsion
              integrals via ellipsoidal expansion},
   journal = {Internat. J. Quantum Chem.},
      year = {2002},
    volume = {88},
    number = {6},
     pages = {701–734},
       doi = {10.1002/qua.10181}}