@misc{miscb23c5484,
title   = {Optimal filters from prior filters},
author = {Dougherty, Edward R. and Barrera, Júnior and Hirata, Nina Sumiko Tomita},
year = {1997},
doi = {10.1117/12.271121},
publisher = {SPIE},
booktitle   = {Nonlinear Image Processing}
}