Add paper to cite if using point loads (#421)

Author: shamsheersc19

README.md

@@ -58,7 +58,7 @@ John P. Jasa, John T. Hwang, and Joaquim R. R. A. Martins. "Open-source coupled
 	Year = {2018}}
 ```
 
-If using the wingbox model, please cite the following [conference paper](https://www.researchgate.net/publication/327654423_Low-Fidelity_Aerostructural_Optimization_of_Aircraft_Wings_with_a_Simplified_Wingbox_Model_Using_OpenAeroStruct).
+If using the wingbox model, fuel-weight inertial loads, or structural-weight inertial loads, please cite the following [conference paper](https://www.researchgate.net/publication/327654423_Low-Fidelity_Aerostructural_Optimization_of_Aircraft_Wings_with_a_Simplified_Wingbox_Model_Using_OpenAeroStruct).
 
 Shamsheer S. Chauhan and Joaquim R. R. A. Martins, “Low-Fidelity Aerostructural Optimization of Aircraft Wings with a Simplified Wingbox Model Using OpenAeroStruct,” Proceedings of the 6th International Conference on Engineering Optimization, EngOpt 2018, Springer, Lisbon, Portugal, September 2018, pp. 418–431. doi:10.1007/978-3-319-97773-7 38
 
@@ -74,6 +74,21 @@ Shamsheer S. Chauhan and Joaquim R. R. A. Martins, “Low-Fidelity Aerostructura
 	Year = {2018}}
 ```
 
+If using point-mass loads or thrust loads, please cite the following [conference paper](https://www.researchgate.net/publication/333806174_How_Certain_Physical_Considerations_Impact_Aerostructural_Wing_Optimization).
+
+John P. Jasa, Shamsheer S. Chauhan, Justin S. Gray, and Joaquim R. R. A. Martins, “How Certain Physical Considerations Impact Aerostructural Wing Optimization,” AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, Dallas, TX, 2019. doi:10.2514/6.2019-3242
+
+```
+@inproceedings{Jasa2019c,
+	Author = {John P. Jasa and Shamsheer S. Chauhan and Justin S. Gray and Joaquim R. R. A. Martins},
+	Address = {Dallas, TX},
+	Booktitle = {AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference},
+	Doi = {10.2514/6.2019-3242},
+	Title = {How Certain Physical Considerations Impact Aerostructural Wing Optimization},
+	Month = {June},
+	Year = {2019}}
+```
+
 Version Information
 -------------------
 The oldest and latest versions of the dependencies that we test regularly are the following (other versions may work, but no guarantees):