Nonlinear dust acoustic waves in a self-gravitating and opposite-polarity complex plasma medium W. F. El-Taibany, S. K. El-Labany, E. E. Behery and A. M. Abdelghany Eur. Phys. J. Plus, 134 9 (2019) 457 Published online: 23 September 2019 DOI: 10.1140/epjp/i2019-12827-3