Effects of symmetry-breaking on the dynamics of the Shinriki’s oscillator Léandre Kamdjeu Kengne, Romanic Kengne, Zeric Tabekoueng Njitacke, Theophile Fozin Fonzin, Roger Mboupda Pone and Hervé Thierry Kamdem Tagne Eur. Phys. J. Spec. Top., 230 7-8 (2021) 1813-1827 Published online: 29 May 2021 DOI: 10.1140/epjs/s11734-021-00130-z