1. Ai C, Chen X (2003) Efficient estimation of models with conditional moment restrictions with unknown functions. Econ 71(6):1795–1843
2. Almeida AN, Souza LRS (2018) Analysis of the consumption patterns in families with and without elderly members between 1987 and 2009 in the Metropolitan Regions of Brazil. J Pop Ag 11:1–31
3. Almeida AN, Amorim DIM, Azzoni CR, Tabosa FJS, Chagas ALS (2020) Gastos Domiciliares nas Regiões Metropolitanas: Uma Análise não Paramétrica Kernel usando Dados de Pseudo-Painel. Rev Bra Est Reg Urb 14(4):574–600
4. Azzoni CR, Almeida AN (2021) Mudanças nas Estruturas de Consumo e Custo de Vida Comparativo nas Regiões Metropolitanas: 1996–2020. Est Econ 51(1):529–563
5. Banks J et al (1997) Quadratic Engel curves and consumer demand. Rev Econ Stat 79(4):527–539