lotta text added

citations.bib

@@ -24,3 +24,19 @@
   url     = {https://grabcad.com/library/6u-cubesat-model-1},
   urldate = {2022-02-15}
 }
+
+@article{hillMeasurementSatelliteImpact,
+  title   = {Measurement of Satellite Impact Test Measurement of Satellite Impact Test Fragments for Modeling Orbital Debris},
+  author  = {Hill, Nicole M.},
+  url     = {https://ntrs.nasa.gov/api/citations/20090019123/downloads/20090019123.pdf},
+  urldate = {2009}
+}
+
+@misc{plane_line,
+  title        = {determine where a vector will intersect a plane},
+  author       = {David Mitra (https://math.stackexchange.com/users/18986/david-mitra)},
+  howpublished = {Mathematics Stack Exchange},
+  note         = {URL:https://math.stackexchange.com/q/100447 (version: 2012-01-19)},
+  eprint       = {https://math.stackexchange.com/q/100447},
+  url          = {https://math.stackexchange.com/q/100447}
+}