References
Abrams, P., Menge, B., Mittelbach, G., Spiller, D. & Yodzis, P. (1996) The Role of Indirect Effects in Food Webs. In G.A. Polis & K.O. Winemiller (Eds.), Food webs (pp. 371-95. Boston, Massachusetts: Springer.
Adamec, R.E. and Shallow, T., 1993. Lasting effects on rodent anxiety of a single exposure to a cat. Physiology & behavior54 (1), 101-9.