Solvable quadratic Lie algebras of dimensions $\leq 8$
  In this paper, we classify solvable Lie algebras of dimensions $\leq 8$ endowed with a nondegenerate invariant symmetric bilinear form over an algebraically closed field. This classification (up to isometrically isomorphisms) is mainly based on the double extension method. 
Minh Thanh Duong and Rosane Ushirobira
math.RA