@inbook{NBERc9197,
 Crossref = "NBERaesm72-2",
 title = "Social Science Computer at the University of Wisconsin: SIMS and SEOSYS",
 author = "Max E. Ellis",
 BookTitle = "Annals of Economic and Social Measurement, Volume 1, number 2",
 Publisher = "NBER",
 pages = "125-135",
 year = "1972",
 month = "April",
 URL = "http://www.nber.org/chapters/c9197",
}
@book{NBERaesm72-2,
 title = "Annals of Economic and Social Measurement, Volume 1, number 2",
 author = "Sanford V. Berg, editor",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1972",
 URL = "http://www.nber.org/books/aesm72-2",
}