Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Masaya Yasuda and Takeshi Shimoyama and Jun Kogure,Secret computation of purchase history data using somewhat homomorphic encryption,Pacific journal of mathematics for industry : PJMI,21886369,Fukuoka : Institute of Mathematics for Industry,2014,6,,37-45,https://cir.nii.ac.jp/crid/1520853834995419136,