@Inbook{ref1, editor="Li, Stan Z. and Jain, Anil", title="Image Formation Process", bookTitle="Encyclopedia of Biometrics", year="2009", publisher="Springer US", address="Boston, MA", pages="725--725", isbn="978-0-387-73003-5", doi="10.1007/978-0-387-73003-5_2270", url="https://doi.org/10.1007/978-0-387-73003-5_2270" }