Bibliographical references

AKERLOF, G. and MIYAZAKI, H. (1980), "The Implicit Contract Theory of Unemployment Meets the Wage Bill Argument", Review of Economic Studies.

AZARIADIS, C. (1983), "Employment with Asymmetric Information", Quarterly Journal of Economics, Supplement. 

FRANK, J. (1986) The New Keynesian Economics, Wheatsheaf. 

HART, O.D. (1983), "Optimal Labour Contracts Under Asymmetric Information", Review of Economic Studies.