Abrams В., Schmitz М. The Crowding out Effect of Government Transfers on Private Charitable Contributions // Public Choice. 1978. Vol. 33. P. 29-39; Abrams B., Schmitz M. The Crowding-Out Effect of Governmental Transfers on Private Charitable Contributions — Cross-Section Evidence // National Tax Journal. 1984. Vol. 37. P. 563-568.