3Impavido,gregorio, 1998.credit rationging,group lending and optimal group size,annals of public&cooperative economics jun vol.69 issue 2.
4Thierry van bsdtelaer,Howard Leathers ,2006.Trust in lending social capital and joint liability seed loans in southern zambia,journal of world development,vol.34, No.10: 1788-1807.
5Peter R.Crabb,Timothy Keller,2004.A Test of Portfolio Risk in Microfinance Institutions.Draft:September 2004.
6Klaus Deininger, Yanyan Liu, 2009.Determinants of repayment performance in Indian micro-credit groups.The World Bank Policy Research Working Paper.
7Thierry van Bastelaer,2000.Does Social Capital Facilitate The Poor's Access To Credit?.The World Bank Social Capital Initiative Working Paper No.8.
8Jorge Luis Rodriguez-Meza,2000.group and individual microcredit contracts a dynamic numerical analysis. Graduate School of The Ohio State University, Dissertation.
9Sergio Navajsa,Jonathan Conningand Claudio Gonzalez-Vega, 2003.Lending Technologies, Competition And Consolidation In The Marker For Microfinace In Bolivia. Journal of International Development.Dev.15,747-770.