Discovery of enigmatic toroidal carbonate concretions on the Rio Grande Rise (Southwestern Atlantic Ocean) - Millo, Christian; Silva, Matheus Henrique Vieira do Nascimento; Mello, Renata Moura de; Leckie, Robert Mark; Benites, Mariana; Giannini, Paulo César Fonseca; Boggiani, Paulo César; Bosence, Dan; Lusty, Paul A. J.; Murton, Bramley J.; Jovane, Luigi (Marine Geology, 2022)