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Kubarych, Thomas S., Steven H. Aggen, Kenneth S. Kendler, Sven Torgersen, Ted Reichborn‐Kjennerud, and Michael C. Neale. Measurement Non‐invariance of DSM‐IV Narcissistic Personality Disorder Criteria Across Age and Sex in a Population‐based Sample of Norwegian Twins. John Wiley & Sons, Ltd, 2010.

Kubarych, Thomas S., et al. Measurement Non‐invariance of DSM‐IV Narcissistic Personality Disorder Criteria Across Age and Sex in a Population‐based Sample of Norwegian Twins. John Wiley & Sons, Ltd, 2010.