Add DOI to leafR manual reference in bibliography

Included the DOI for the leafR manual citation to ensure proper referencing and easy access. This enhances the academic integrity and traceability of the cited resource within the paper.

Author: iosefa

paper/paper.bib

@@ -59,6 +59,7 @@ @article{drakeEstimationTropicalForest2002
 @report{dealmeidaLeafRCalculatesLeaf2021,
 	title = {{leafR: Calculates the Leaf Area Index (LAD) and Other Related Functions}},
 	url = {https://CRAN.R-project.org/package=leafR},
+	doi = {10.32614/CRAN.package.leafR},
 	type = {manual},
 	author = {de Almeida, Danilo Roberti Alves and Stark, Scott Christopher and Silva, Carlos Alberto and Hamamura, Caio and Valbuena, Ruben},
 	date = {2021},