In a previous work exact stable oblique soliton solutions were revealed inView original: http://arxiv.org/abs/1202.0697
two dimensional nonlinear Schroedinger flow. In this work we show that single
soliton solution can be expressed within the Hirota bilinear formalism. An
attempt to build two-soliton solutions shows that the system is "close" to
integrability provided that the angle between the solitons is small and/or we
are in the hypersonic limit.