Solitons and critical breakup fields in lithium niobate type uniaxial ferroelectrics A. K. Bandyopadhyay, P. C. Ray and V. Gopalan Eur. Phys. J. B, 65 4 (2008) 525-531 Published online: 27 September 2008 DOI: 10.1140/epjb/e2008-00356-9