Feature/update references

docs/source/references.bib

@@ -471,3 +471,57 @@ @article{nowotschin:19
     doi={10.1038/s41586-019-1127-1},
     publisher={Nature Publishing Group}
 }
+
+@article{bergen:21,
+  title={RNA velocity—current challenges and future perspectives},
+  author={Bergen, Volker and Soldatov, Ruslan A and Kharchenko, Peter V and Theis, Fabian J},
+  journal={Molecular systems biology},
+  volume={17},
+  number={8},
+  pages={e10282},
+  year={2021}
+}
+
+@article{street:18,
+  title={Slingshot: cell lineage and pseudotime inference for single-cell transcriptomics},
+  author={Street, Kelly and Risso, Davide and Fletcher, Russell B and Das, Diya and Ngai, John and Yosef, Nir and Purdom, Elizabeth and Dudoit, Sandrine},
+  journal={BMC genomics},
+  volume={19},
+  number={1},
+  pages={1--16},
+  year={2018},
+  publisher={Springer}
+}
+
+@article{barile:21,
+  title={Coordinated changes in gene expression kinetics underlie both mouse and human erythroid maturation},
+  author={Barile, Melania and Imaz-Rosshandler, Ivan and Inzani, Isabella and Ghazanfar, Shila and Nichols, Jennifer and Marioni, John C and Guibentif, Carolina and G{\"o}ttgens, Berthold},
+  journal={Genome biology},
+  volume={22},
+  number={1},
+  pages={1--22},
+  year={2021},
+  publisher={BioMed Central}
+}
+
+@article{saelens:19,
+  title={A comparison of single-cell trajectory inference methods},
+  author={Saelens, Wouter and Cannoodt, Robrecht and Todorov, Helena and Saeys, Yvan},
+  journal={Nature biotechnology},
+  volume={37},
+  number={5},
+  pages={547--554},
+  year={2019},
+  publisher={Nature Publishing Group}
+}
+
+@article{haghverdi:15,
+  title={Diffusion maps for high-dimensional single-cell analysis of differentiation data},
+  author={Haghverdi, Laleh and Buettner, Florian and Theis, Fabian J},
+  journal={Bioinformatics},
+  volume={31},
+  number={18},
+  pages={2989--2998},
+  year={2015},
+  publisher={Oxford University Press}
+}