update link for two aerial manipulation papers

_bibliography/references.bib

@@ -5,7 +5,9 @@ @article{guo2024flying
   abstract={Aerial manipulation has gained interest in completing high-altitude tasks that are challenging for human workers, such as contact inspection and defect detection, etc. Previous research has focused on maintaining static contact points or forces. This letter addresses a more general and dynamic task: simultaneously tracking time-varying contact force in the surface normal direction and motion trajectories on tangential surfaces. We propose a pipeline that includes a contact-aware trajectory planner to generate dynamically feasible trajectories, and a hybrid motion-force controller to track such trajectories. We demonstrate the approach in an aerial calligraphy task using a novel sponge pen design as the end-effector, whose stroke width is positively related to the contact force. Additionally, we develop a touchscreen interface for flexible user input. Experiments show our method can effectively draw diverse letters, achieving an IoU of 0.59 and an end-effector position (force) tracking RMSE of 2.9 cm (0.7N).},
   video={https://www.youtube.com/watch?v=g5egNbtQCwA&pp=ygUTZmx5aW5nIGNhbGxpZ3JhcGhlcg%3D%3D},
   year={2024},
-  publisher={IEEE}
+  publisher={IEEE},
+  doi={10.1109/LRA.2024.3486236},
+  url={https://arxiv.org/pdf/2407.05587}
 }
 
 @inproceedings{santos2024unisat,
@@ -203,6 +205,8 @@ @inproceedings{guo2024aerial
   booktitle={2024 IEEE International Conference on Robotics and Automation (ICRA)},
   pages={1576--1582},
   year={2024},
+  doi = {https://doi.org/10.1109/ICRA57147.2024.10611282},
+  url = {https://arxiv.org/pdf/2310.00142},
   organization={IEEE}
 }
 @inproceedings{he2023image,