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Jennrich RI (2004). “Derivative free gradient projection algorithms for rotation.” Psychometrika, 69, 475–480. doi:10.1007/BF02295647.

Bernaards CA, Jennrich RI (2005). “Gradient Projection Algorithms and Software for Arbitrary Rotation Criteria in Factor Analysis.” Educational and Psychological Measurement, 65, 676–696. doi:10.1177/0013164404272507.

Corresponding BibTeX entries:

  @Article{,
    title = {Derivative free gradient projection algorithms for
      rotation},
    author = {Robert I. Jennrich},
    journal = {Psychometrika},
    year = {2004},
    volume = {69},
    issue = {3},
    pages = {475--480},
    doi = {10.1007/BF02295647},
  }
  @Article{,
    title = {Gradient Projection Algorithms and Software for Arbitrary
      Rotation Criteria in Factor Analysis},
    author = {Coen A. Bernaards and Robert I. Jennrich},
    journal = {Educational and Psychological Measurement},
    year = {2005},
    volume = {65},
    issue = {5},
    pages = {676--696},
    doi = {10.1177/0013164404272507},
  }

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