Koech FK. Relative Efficiency Criteria for the Six Specific Calculus Optimum Values Second Order Rotatable Designs with a Practical Example on Twenty-Four Points. theijst [Internet]. 2022 Apr. 30 [cited 2024 Jun. 16];10(4). Available from: http://www.internationaljournalcorner.com/index.php/theijst/article/view/169460