1. Resolution Adapted Powell's Method  
   Mark Jenkinson, Clinical Neurology Dept., Oxford University, UK  
2. Powell Conjugate Direction  
   Sundar Krishnamurty, Mech. Engr. Dept., University of Massachusetts,  Amherst, MA  
3. Davidon-Fletcher-Powell Method  
   Mats Holmström, Scientific Computing Dept., Uppsala University, Sweden  
4. The Powell conjugate gradient algorithm  
   Marco Delaurenti, Electrical Engineering , Politecnico di Torino, Italy  
5. Uses a variation of Powell's conjugate direction method  
   Harmonic Software Inc., Seattle, WA
6. Conjugate Directions  
   Bob Fisher, Reader, School of Informatics, University of Edinburgh, Scotland  
7. Conjugate Gradient Method      
   Eric Weisstein, MathWorld, Wolfram Research Inc., Champaign, IL  
8. A description of the Praxis algorithm   
   WEST++, Mathematics and Biometrics Dept., University of Gent, Belgium  
9. Conjugate direction  
   Jos Claerbout, Stanford Exploration Project, Stanford  University, CA   
10. Conjugate Direction Methods
    Mats Holmström,  Scientific Computing Dept., Uppsala University, Sweden  
11. Conjugate Gradient Method   
    Dave Zachmann, Math. Dept., Colorado State University, Fort Collins, CO  
12. Conjugate Gradient Method
    Franz J. Vesely, Physics Dept., University of Vienna, Austria  
13. Conjugate Gradient  PDF  
    Mubarak Shah, School of Computer Science, University of Central Florida, Orlando, FL  
14. Direction Set (Powell's) Methods in Multidimensions  PDF  
    William H. Press, Cornell University Library, Ithaca, NY  

(c) John H. Mathews 2004