Basarir H. Poor, multidimensionally speaking: evidence from South Africa. J Afr Econ. 2011 Jun 1;20(3):463-504. doi: 10.1093/jae/ejr001
Watts (Wideman) K, McAvinchey G, Quiroz R. Language services in survey research. ATA Chronicle. 2002 Jul;31(7):36-7.
Suit HD, Sedlacek R, Fagundes L, Goitein M, Rothman KJ. Time distribution of recurrences of an immunogenic and non-immunogenic tumor following local irradiation. Radiat Res. 1978 Feb;73(2):251-66.