1. The caltech-ucsd birds-200-2011 dataset;Wah,2011
2. Building a bird recognition app and large scale dataset with citizen scientists: The fine print in fine-grained dataset collection;Van,2015
3. Fine-Grained Categorization by Alignments
4. Improved bird species recognition using pose normalized deep convolutional nets;Branson,2014
5. Part-Stacked CNN for Fine-Grained Visual Categorization