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The general form of solutions for parameters of interfering Breit-Wignerresonances is found. The number of solutions is determined by the properties ofroots of corresponding characteristic equation and does not exceed $2^{N-1}$,where $N$ is the number of resonances. For resonances of more complicated form,provided that their amplitudes satisfy certain conditions, for any $N\ge2$multiple solutions also exist.

On the ambiguity of determination of interfering resonances parameters