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It is also proved that the necessary and sufficient condition for any quadratic or linear form to be distributed independently of a sum of a finite number of non-negative definite quadratic forms is that it is distributed independently of each one of them.<\/jats:p>","DOI":"10.1111\/j.2517-6161.1962.tb00446.x","type":"journal-article","created":{"date-parts":[[2018,12,7]],"date-time":"2018-12-07T05:17:57Z","timestamp":1544159877000},"page":"148-151","source":"Crossref","is-referenced-by-count":21,"title":["On the Distribution of Certain Quadratic Forms in Normal Variates"],"prefix":"10.1093","volume":"24","author":[{"given":"B. 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