When was the research paper on Parseval wavelet frames by St. Petersburg State University, Russia published?
St. Petersburg State University published a paper on Parseval wavelet frames in what year?
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/journals/amc/Skopina17> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> 'St. Petersburg State University, Russia' . <https://dblp.org/rec/journals/amc/Skopina17> <https://dblp.org/rdf/schema#yearOfPublication> ?answer }
<https://dblp.org/rec/journals/amc/Skopina17>