[Lazy Fool 1 (OP)]

Here

Spiridonov V. (1995) Universal superpositions of coherent states and self-similar potentials. Physical Review A, 52, 1909-1935.

is an article that is interesting to me with its mathematical problems, but physically it is too complicated for me. Tell me, please, what are we talking about? I need at least in the most general terms to refer to the source of mathematical problems. Maybe there are some practical applications. Thank.