Updated sources with new references.

docs/Sources.bib

 Methodology Sources and References
 
+@article{gault1966patterns,
+  author                   = {Gault, James H and Ross, John and Mason, Dean T},
+  journal                  = {Ciculation},
+  number                   = {November 1966},
+  pages                    = {833--847},
+  title                    = {{Patterns of Brachial Arterial Blood Flow in Conscious Human Subjects with and without Cardiac Dysfunction}},
+  url                      = {http://ahajournals.org},
+  volume                   = {XXXIV},
+  year                     = {1966}
+}
+
+@article{holland1998ultrasound,
+  issn                     = {0301-5629},
+  journal                  = {Ultrasound in medicine {\&} biology},
+  month                    = {oct},
+  number                   = {8},
+  pages                    = {1079--86},
+  pmid                     = {9833575},
+  title                    = {{Lower extremity volumetric arterial blood flow in normal subjects.}},
+  url                      = {http://www.ncbi.nlm.nih.gov/pubmed/9833575},
+  volume                   = {24},
+  year                     = {1998}
+}
+
+
 @Article{abbas2003echocardiographic,
   Title                    = {Echocardiographic Determination of Mean Pulmonary Artery Pressure},
   Author                   = {Abbas and others},