Isometric immersions in codimension two of warped products into space   forms
  We provide a local classification of isometric immersions $f\colon L^p\times_\rho M^n\to\Q_c^{p+n+k}$ in codimensions $k=1, 2$ of warped products of Riemannian manifolds into space forms, under the assumptions that $n\geq k+1$ and that $N^{p+n}=L^p\times_\rho M^n$ has no points with the same constant sectional curvature $c$ as the ambient space form. 
M. Dajczer & R. Tojeiro