@inbook{121336,
author={David T. Schwartz},
title={Chapter I-2. Subtle Pneumonia—Silhouette Signs},
booktitle={Emergency Radiology: Case Studies},
publisher={The McGraw-Hill Companies},
address={New York, NY},
year={2008},
url={accessemergencymedicine.mhmedical.com/content.aspx?aid=121336}
}