WITHERS, CHRISTOPHER S.; NADARAJAH, SARALEES. Joint cumulants of quadratic forms in noncentral normal vectors. Utilitas Mathematica , [S. l.], v. 85, 2011. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/788. Acesso em: 8 may. 2026.