diff --git a/papers/hawick.pdf b/papers/hawick.pdf
new file mode 100644
index 0000000..88b0e8b
Binary files /dev/null and b/papers/hawick.pdf differ
diff --git a/papers/johnson.pdf b/papers/johnson.pdf
new file mode 100644
index 0000000..5438b3a
Binary files /dev/null and b/papers/johnson.pdf differ
diff --git a/papers/tarjan.pdf b/papers/tarjan.pdf
new file mode 100644
index 0000000..67f58bb
Binary files /dev/null and b/papers/tarjan.pdf differ