instruction: Does Philipp Haberstock ever collaborated with Ludwig Nastansky ?
response: SELECT DISTINCT WRITES_0.paperid FROM author AS AUTHOR_0, author AS AUTHOR_1, writes AS WRITES_0, writes AS WRITES_1 WHERE AUTHOR_0.authorname = 'Philipp Haberstock' AND AUTHOR_1.authorname = 'Ludwig Nastansky' AND WRITES_0.authorid = AUTHOR_0.authorid AND WRITES_1.authorid = AUTHOR_1.authorid AND WRITES_1.paperid = WRITES_0.paperid