A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Andrés Ruiz
Date: 2010 Dec 9, 11:28 +0100
In a personal letter with Mr. Kaplan he tells me that the Least squares algorithm for n LOPs is originally by DeWit . And USA Nautical Almanac and HMNAO Compac Data  have adopted it.
 Optimal Estimation of a Multi-Star Fix, C. De Wit. NAVIGATION, Vol.21 , No. 4, Winter 1974-75, pp 320-325.