“…The subject of gravitational lensing beyond weak deflection approximation becomes very popular, because in the strong field regime it is possible to differ and compare different theories of gravity, see, for example, Refs. [57,3,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78]. Nevertheless, there are no big chances so far to observe the high-order images.…”