Mixed-phase space of an active particle in experimental lemon billiards - Quirino, Ruan Victor Almeida; Leal, Francisco Carol Bonfim; Vasconcelos, João Victor Alves; Silva, Matheus Palmero; Romaguera, Antonio Rodrigues de Castro; Barbosa, Anderson Luiz da Rocha e; Lima, Tiago Araújo (Physical Review E, 2025)