Geodesic
Bifurcation of the Point of Equilibrium in Systems with Zero Roots of the Characteristic Equation
Matematičeskie zametki, Tome 75 (2004) no. 3, pp. 323-341.

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We consider the following real autonomous system of $2d$ differential equations with a small positive parameter $\varepsilon $: $$ \dot x_i=x_{i+d}+X_i^{(n+1)}(x,\varepsilon ),\qquad \dot x_{i+d}=-x_i^{2n-1}+X_{i+d}^{(2n)}(x,\varepsilon ),\qquad i=1,\dots,d, $$ where $d\ge 2$, $n\ge 2$, and the $X_j^{(k)}$ are continuous functions continuously differentiable with respect to $x$ and $\varepsilon $ the required number of times in the neighborhood of zero; their expansion begins with order $k$ if we assume that the variables $x_i$ are of first order of smallness, $\varepsilon $ is of second order, and the variables $x_{i+d}$ are of order $n$. We write out a finite number of explicit conditions on the coefficients of the lower terms in the expansion of the right-hand side of this system guaranteeing that for any sufficiently small $\varepsilon > 0$ the system has one or several $d$-dimensional invariant tori with infinitely small frequencies of motions on them. 
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V. V. Basov. Bifurcation of the Point of Equilibrium in Systems with Zero Roots of the Characteristic Equation. Matematičeskie zametki, Tome 75 (2004) no. 3, pp. 323-341. http://geodesic.mathdoc.fr/item/MZM_2004_75_3_a0/

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