Solitons in optical metamaterials with anti-cubic nonlinearity Anjan Biswas, Mehmet Ekici, Abdullah Sonmezoglu, Qin Zhou, Ali Saleh Alshomrani, Seithuti P. Moshokoa and Milivoj Belic Eur. Phys. J. Plus, 133 5 (2018) 204 Published online: 30 May 2018 DOI: 10.1140/epjp/i2018-12046-6