เอกสารใดบ้างที่มี "สเตฟานี ไวริช" เป็นผู้เขียน?
Which papers have "Stephanie Weirich" as an author?
authorship = pd.DataFrame(columns=['authid', 'paperid']); papers = pd.DataFrame(columns=['title', 'paperid']); authors = pd.DataFrame(columns=['authid', 'fname', 'lname'])
papers.loc[papers['paperid'].isin(authorship.loc[authors[(authors['fname'] == 'Stephanie') & (authors['lname'] == 'Weirich')]['authid'], 'paperid']), 'title']