Merge pull request #237 from katmratliff/master

update paper doi's

paper/paper.bib

@@ -46,7 +46,8 @@ @inproceedings{li:2019
  booktitle={World Environmental and Water Resources Congress 2019: Water, Wastewater, and Stormwater; Urban Water Resources; and Municipal Water Infrastructure},
  pages={46--56},
  year={2019},
- organization={American Society of Civil Engineers Reston, VA}
+ organization={American Society of Civil Engineers Reston, VA},
+ doi={10.1061/9780784482360.006}
 }
 
 @article{sadler:2019,
@@ -56,7 +57,8 @@ @article{sadler:2019
  volume={120},
  pages={104484},
  year={2019},
- publisher={Elsevier}
+ publisher={Elsevier},
+ doi={10.1016/j.envsoft.2019.07.009}
 }
 
 @inproceedings{ratliff:2018,
@@ -74,7 +76,8 @@ @article{niazi:2017
  number={2},
  pages={04017002},
  year={2017},
- publisher={American Society of Civil Engineers}
+ publisher={American Society of Civil Engineers},
+ doi={10.1061/JSWBAY.0000817}
 }
 
 @techreport{swmm,
@@ -93,7 +96,7 @@ @article{macro:2019
 pages = "42 - 47",
 year = "2019",
 issn = "1364-8152",
-doi = "https://doi.org/10.1016/j.envsoft.2018.12.004",
+doi = "10.1016/j.envsoft.2018.12.004",
 url = "https://www.sciencedirect.com/science/article/pii/S1364815218307515",
 author = "Kristina Macro and L. Shawn Matott and Alan Rabideau and Seyed Hamed Ghodsi and Zhenduo Zhu",
 keywords = "Green infrastructure, Multi-objective optimization, SWMM, Rain barrel",
@@ -108,5 +111,6 @@ @article{leutnant:2019
  number={1},
  pages={68--76},
  year={2019},
- publisher={Taylor \& Francis}
+ publisher={Taylor \& Francis},
+ doi={10.1080/1573062X.2019.1611889}
 }