What are the titles of the papers on Der definitionsphase that were published in IWBS Report in 1990?
In the year 1990 in IWBS Report, what are the titles of the research papers on Der definitionsphase?
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/tr/ibm/IWBS145> <https://dblp.org/rdf/schema#publishedIn> 'IWBS Report' . <https://dblp.org/rec/tr/ibm/IWBS145> <https://dblp.org/rdf/schema#yearOfPublication> '1990' . <https://dblp.org/rec/tr/ibm/IWBS145> <https://dblp.org/rdf/schema#title> ?answer }
<https://dblp.org/rec/tr/ibm/IWBS145>