  It was proved recently that the correlation functions of a semi-simple
cohomological field theory satisfy the so called Eynard--Orantin topological
recursion. We prove that in the settings of singularity theory, the relations
can be expressed in terms of periods integrals and the so called phase forms.
In particular, we prove that the Eynard-Orantin recursion is equivalent to $N$
copies of Virasoro constraints for the ancestor potential, which follow easily
from the definition of the potential.
