@inbook{NBERc11697,
 Crossref = "NBERkmen80-1",
 title = "Aggregation and Disaggregation of Nonlinear Equations",
 author = "Harry H. Kelejian",
 BookTitle = "Evaluation of Econometric Models",
 Publisher = "Academic Press",
 pages = "135-152",
 year = "1980",
 URL = "http://www.nber.org/chapters/c11697",
}
@book{NBERkmen80-1,
 title = "Evaluation of Econometric Models",
 author = "Jan Kmenta and James B. Ramsey",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Academic Press",
 year = "1980",
 URL = "http://www.nber.org/books/kmen80-1",
}