Yuri Alexeev Michael W. Schmidt Theresa L. Windus Mark S. Gordon A parallel distributed data CPHF algorithm for analytic Hessians. 1685-1694 2007 28 Journal of Computational Chemistry 10 http://dx.doi.org/10.1002/jcc.20633 db/journals/jcc/jcc28.html#AlexeevSWG07