1. Dürr, V (2014). Stick insect antennae. Scholarpedia 9(2): 6829.
http://www.scholarpedia.org/article/Stick_Insect_Antennae
. (see also pages 45–63 of this book).
2. Reep, R and Sarko, D K (2009). Tactile hair in manatees. Scholarpedia 4(4): 6831.
http://www.scholarpedia.org/article/Tactile_hair_in_Manatees
. (see also pages 141–148 of this book).