Name the venue in which Opolka published the paper about Theta functions.
In which venue did Opolka publish the paper about Theta functions?
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/conf/aaecc/Opolka85> <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/57/3928> . <https://dblp.org/rec/conf/aaecc/Opolka85> <https://dblp.org/rdf/schema#publishedIn> ?answer }
<https://dblp.org/pid/57/3928> <https://dblp.org/rec/conf/aaecc/Opolka85>