Asner, Jr., On the Total Nonnegativity of the Hurwitz Matrix, SIAM Journal on Applied Mathematics, Vol.. 
Champaigne ni oníṣẹ́ ọnà tí wọ́n gbà láàyè lodará ya àwòrán Richelieu tí wọ́n fi sàmì, tí ó ṣe ní ìgbà mọ́lẹ̀.. 