XIAO, Songlin. A New Generalization of the Haddock Conjecture. Mathematical Modelling and Analysis, [S. l.], v. 22, n. 5, p. 634–642, 2017. DOI: 10.3846/13926292.2017.1343206. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/918. Acesso em: 13 may. 2025.