Continuous analogs of polynomials orthogonal on the unit circle. Krein systems
arXiv:0908.4049
Abstract
This survey contains the introduction to the subject. Many new results are also included.
Prepint with corrected typos. The final version published in IMRS by Hindawi Publishing corporation, http://imrs.oxfordjournals.org/cgi/content/abstract/2006/54517/54517