Is There Bias in Computing Household Equivalence Scales? 6.67
Maria Luisa Ferreira, Reuben Buse, Jean Paul Chavas
Review of Income and Wealth, vol. 44, 1998, p. 183-198.

Barten Group Equivalence Scales and Barten Group Indexes 10.0
Maria Luisa Ferreira, Federico Perali
Economics Letters, vol. 40, 1992, p. 13-18.