Chung Y, Rabe-Hesketh S, Dorie V, Gelman A, Liu J (2013). “A nondegenerate penalized likelihood estimator for variance parameters in multilevel models.” Psychometrika, 78(4), 685–709. doi:10.1007/s11336-013-9328-2.

Corresponding BibTeX entry:

  @Article{,
    title = {A nondegenerate penalized likelihood estimator for
      variance parameters in multilevel models},
    author = {Yeojin Chung and Sophia Rabe-Hesketh and Vincent Dorie
      and Andrew Gelman and Jingchen Liu},
    year = {2013},
    journal = {Psychometrika},
    volume = {78},
    number = {4},
    pages = {685--709},
    publisher = {Springer},
    doi = {10.1007/s11336-013-9328-2},
  }