\[
\boxed{
{\frac {{\rm d}^{3}}{{\rm d}{x}^{3}}}y \left( x \right) - \left( 4\,n \left( n+1 \right) {\it WeierstrassP} \left( x,{\it g2},{\it g3} \right) +a \right) {\frac {\rm d}{{\rm d}x}}y \left( x \right) -2\,n \left( n+1 \right) {\it WeierstrassPPrime} \left( x,{\it g2},{\it g3} \right) y \left( x \right) =0}
\]