@ARTICLE{Huang-0909-0751,
 author = "Neil Barnaby, Zhiqi Huang",
 title = "{Particle production during inflation: Observational constraints and signatures}",
 journal = "{PRD}",
 year = {2009},
 month = {Dec},
 date = {29},
 volume = {80},
 issue = {12},
 pages = {126018},
 doi = {10.1103/PhysRevD.80.126018},
 archivePrefix = {arXiv},
 eprint = {0909.0751}
}