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  1. 1
    by Dissanayake, Mallika
    Published 1987
    Subjects “...Cost and standard of living Sri Lanka Mathematical models....”
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    Household expenditure in Sri Lanka : an Engel curve analysis /
  2. 2
    by Giles, David E. A., 1949-
    Published 1984
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    An Engel curve analysis of household expenditure in New Zealand /

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