An alternative Cattell-Horn-Carroll (CHC) factor structure of the WAIS-IV: age invariance of an alternative model for ages 70-90.
Niileksela CR, Reynolds MR, Kaufman AS. An alternative Cattell-Horn-Carroll (CHC) factor structure of the WAIS-IV: age invariance of an alternative model for ages 70-90. Psychol Assess. 2013 Jun; 25(2):391-404.