@inbook{NBERc4675,
 Crossref = "NBERcomm23-1",
 title = "Unemployment Insurance",
 author = "Leo Wolman",
 BookTitle = "Business Cycles and Unemployment",
 Publisher = "NBER",
 pages = "304-343",
 year = "1923",
 URL = "http://www.nber.org/chapters/c4675",
}
@book{NBERcomm23-1,
 title = "Business Cycles and Unemployment",
 author = "",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1923",
 URL = "http://www.nber.org/books/comm23-1",
}