Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Christoph Kühn and Andreas E. Kyprianou,CALLABLE PUTS AS COMPOSITE EXOTIC OPTIONS,Mathematical Finance,0960-1627,Wiley,2007-09-14,17,4,487-502,https://cir.nii.ac.jp/crid/1360011146547806080,https://doi.org/10.1111/j.1467-9965.2007.00313.x