@book{ BA18620789, author = "湯川, 摂子 ", title = "La seguridad social en México : un análisis comparativo", publisher = "Kyoto Sangyo University", year = "1968", series = "Study series of the Institute for Economic Research, Kyoto Sangyo University", number = "1", URL = "https://ci.nii.ac.jp/ncid/BA18620789" }