diff --git a/medup-requirements/draft-symeonidis-medup-requirements.mkd b/medup-requirements/draft-symeonidis-medup-requirements.mkd
index 82f9aa21..14a54ecb 100644
--- a/medup-requirements/draft-symeonidis-medup-requirements.mkd
+++ b/medup-requirements/draft-symeonidis-medup-requirements.mkd
@@ -34,14 +34,8 @@ informative:
 {::include ../shared/references/pfitzmann-terminology-privacy.mkd}
 {::include ../shared/references/tor-timing-attacks.mkd}
 {::include ../shared/references/diaz-measuring-anonymity.mkd}
-
-# # TODO: add the following
-# Ksenia Ermoshina, Francesca Musiani, Harry Halpin:
-# End-to-End Encrypted Messaging Protocols: An Overview. INSCI 2016: 244-254
-# 
-# Jeremy Clark, Paul C. van Oorschot, Scott Ruoti, Kent E. Seamons, Daniel Zappala:
-# Securing Email. CoRR abs/1804.07706 (2018)
-
+{::include ../shared/references/ermoshina-end2end-enc.mkd}
+{::include ../shared/references/clark-seuring-email.mkd}
 
 # {::include ../shared/references/ed-keysync.mkd}
 # {::include ../shared/references/isoc-btn.mkd}
@@ -166,7 +160,7 @@ https://autocrypt.org/background.html
 
 This section outlines the functional requirements. We follow the
 requirements extracted from the literature on private emails and
-instant messaging {{Unger}}.
+instant messaging {{Unger}} {{Ermoshina}} {{Clark}}.
 
 * Message: send and receive message(s)
 * Multi-device support: synchronisation across multiple devices
diff --git a/shared/references/clark-seuring-email.mkd b/shared/references/clark-seuring-email.mkd
new file mode 100644
index 00000000..55ff3436
--- /dev/null
+++ b/shared/references/clark-seuring-email.mkd
@@ -0,0 +1,22 @@
+  Clark:
+    # target:
+    title: "Securing Email"
+    author:
+      -
+        name: Jeremy Clark
+        ins: J. Clark
+      -
+        name: Paul C. van Oorschot
+        ins: P. C. van Oorschot
+      -
+        name: Scott Ruoti
+        ins: S. Ruoti
+      -
+        name: Kent E. Seamons
+        ins:  K. E. Seamons
+      -
+        name: Daniel Zappala
+        ins: D. Zappala
+    date: 2018
+    seriesinfo:
+      CoRR: abs/1804.07706
diff --git a/shared/references/ermoshina-end2end-enc.mkd b/shared/references/ermoshina-end2end-enc.mkd
new file mode 100644
index 00000000..e878096e
--- /dev/null
+++ b/shared/references/ermoshina-end2end-enc.mkd
@@ -0,0 +1,16 @@
+  Ermoshina:
+    # target:
+    title:  "End-to-End Encrypted Messaging Protocols: An Overview"
+    author:
+      -
+        name: Ksenia Ermoshina
+        ins: K. Ermoshina
+      -
+        name: Francesca Musiani
+        ins: F. Musiani
+      -
+        name: Harry Halpin
+        ins: H. Halpin
+    date: 2016
+    seriesinfo:
+      INSCI: "2016: pp. 244-254"