  We consider two phaseless inverse problems for elliptic equation. The
statements of these problems differ from have considered. Namely, instead of
given information about modulus of scattering waves, we consider the
information related to modulus of full fields, which consist of sums of
incident and scattering fields. These full fields are the interference fields
generated by point sources. We introduce a set of auxiliary point sources for
solving the inverse problems and demonstrate that the corresponding data allow
us to solve the inverse problems in a way similar to the case of measurements
of scattering waves.
