diff --git a/Gleeson_paper.bib b/Gleeson_paper.bib
index 953f99b..86bb55e 100755
--- a/Gleeson_paper.bib
+++ b/Gleeson_paper.bib
@@ -91,7 +91,6 @@
   type = {PhD thesis},
   address = {Wichita, Kansas},
   pdf = {B/Bend-G-1999-PhD.pdf},
-  url = {http://www.thisoldtractor.com/gtbender/papers/dissertation.pdf},
 }
 
 @BOOK{Appl-2004-HIG,
@@ -101,7 +100,6 @@
   author = {{Apple Computer}},
   month = may,
   pdf = {A/Appl-2004-HIG.pdf},
-  url = {http://developer.apple.com/documentation/UserExperience/Conceptual/OSXHIGuidelines/index.html},
 }
 
 @INPROCEEDINGS{Doug-SA-1999-CHI,
@@ -131,6 +129,17 @@
   isbn = {0-89791-650-6},
 }
 
+@ARTICLE{Hara-H-1996,
+  author = {Harada, H. and Katsuura, T. and Kikuchi, Y.},
+  title = {Fundamental study on the size and inter-key spacing of numeric keys for touch screen},
+  journal = {Journal of Human Ergology},
+  year = {1996},
+  volume = {25},
+  pages = {167--174},
+  number = {2},
+  month = dec,
+}
+
 @TECHREPORT{ISO-2000-9241-9,
   author = {ISO},
   title = {Ergonomic {R}equirements for {O}ffice {W}ork with {V}isual {D}isplay {T}erminals ({VDT}s)---{P}art 9: {R}equirements for {N}on-keyboard {I}nput {D}evices},
@@ -155,7 +164,6 @@
   publisher = {Springer},
   isbn = {3-540-43044-X},
   pdf = {M/Mack-IS-2001-EHCI.pdf},
-  url = {http://link.springer.de/link/service/series/0558/bibs/2254/22540235.htm},
   citeseerurl = {http://citeseer.ist.psu.edu/609516.html},
 }
 
@@ -180,6 +188,30 @@
   isbn = {0735605661},
 }
 
+@INPROCEEDINGS{Po-BA-2004-CHI,
+  author = {Barry A. Po and Brian D. Fisher and Kellogg S. Booth},
+  title = {Mouse and touchscreen selection in the upper and lower visual fields},
+  booktitle = {Proceedings of the 2004 Conference on Human Factors in Computing Systems (CHI 2004)},
+  year = {2004},
+  editor = {Elizabeth Dykstra-Erickson and Manfred Tscheligi},
+  pages = {359--366},
+  address = {Vienna, Austria},
+  month = apr # {~24--29},
+  doi = {doi:10.1145/985692.985738},
+  pdf = {P/Po-BA-2004-CHI.pdf},
+}
+
+@ARTICLE{Sear-A-1993-BIT,
+  author = {Andrew Sears and D. Revis and J. Swatski and R. Crittenden and Ben Shneiderman},
+  title = {Investigating touchscreen typing: {T}he effect of keyboard size on typing speed},
+  journal = {Behavior {\&} Information Technology},
+  year = {1993},
+  volume = {12},
+  pages = {17--22},
+  number = {1},
+  month = jan # {--} # feb,
+}
+
 @ARTICLE{Sear-A-1991-IJMMS,
   author = {Andrew Sears and Ben Shneiderman},
   title = {High precision touchscreens: {D}esign strategies and comparisons with a mouse},