vouchers

n.

someone who vouches for another or for the correctness of a statement

同义词：verifier

a document that serves as evidence of some expenditure

a negotiable certificate that can be detached and redeemed as needed

同义词：coupon

Mobility, Targeting, and Private-School Vouchers
Method for marketing and redeeming vouchers for use in online purchases
ENFORCING AUTHORIZED DOMAINS WITH DOMAIN MEMBERSHIP VOUCHERS
Vouchers for Private Schooling in Colombia: Evidence from a Randomized Natural Experiment. NBER Working Paper Series.
Private School Vouchers and Student Achievement: An Evaluation of the Milwaukee Parental Choice Program
Private School Vouchers and Student Achievement: An Evaluation of the Milwaukee Parental Choice Program
Self-contained payment system with circulating digital vouchers
Competition between Private and Public Schools, Vouchers, and Peer-Group Effects
Replication data for: Vouchers for Private Schooling in Colombia: Evidence from a Randomized Natural Experiment
Public Housing, Housing Vouchers, and Student Achievement: Evidence from Public Housing Demolitions in Chicago