1. Sally Clark is wrongly convicted of murdering her children Bayesian Intelligence http://bayesian-intelligence.com/bwb/2012-03/sally-clark-is-wrongly-convicted-of-murdering-her-children/
2. The chi squared and multinormal distributions;Brereton;J. Chemometr.,2015
3. Independent random variables Statlect - The digital textbook http://www.statlect.com/inddst1.htm