O'Connell, C., L. Hart & B.T. Arnason. 1998. Comments on "Elephant hearing." J. Acoust. Soc. Am. 105:2051-2052.

O'Connell-Rodwell, C., B.T. Arnason & L.A. Hart. 2000. Seismic properties of Asian elephant (Elephas maximus) vocalizations and locomotion. Acoust. Soc. Am.108 (6) 3066-3072.

O'Connell-Rodwell, C. E., Wood, J. D., Rodwell, T. C., Puria, S., Shriver, D., Partan, S. R., Keefe, R., Arnason, B. T., and Hart, L. A. 2006. Wild elephant Loxodonta africana breeding herds respond to artificially transmitted seismic stimuli. Behav. Ecol. Sociobiol. 59 (6) 842-850.

O'Connell-Rodwell, C., Wood, J.D., Kinzley, C., Rodwell, T.C., Poole, J., & Puria, S. 2007. Wild African elephants (Loxodonta africana) discriminate between familiar and unfamiliar conspecific seismic alarm calls. J. Acoust. Soc. Am. 122: 823-830.

O'Connell-Rodwell, C.E. 2007. Keeping an "ear" to the ground: Seismic communication in elephants. Physiology 22:287-294.

Rasmussen, L.E.L. & B. Munger. 1996. The sensorimotor specializations of the trunk tip of the Asian elephant, Elephas maximus. The Anatomical Record 246:127-134.

Reuter T., S. Nummela & S. Hemila. 1998. Elephant Hearing. J. Acoust. Soc. Am. 104:1122-1123.

Weissengruber GE, Egger GF, Hutchinson JR, Groenewald HB, Elsasser L, Famini D,
Forstenpointner G. The structure of the cushion in the feet of African elephants (Loxodonta africana). J Anat 209: 181-192, 2006.

 

You may want to search for these or other papers through the
African Elephant Bibliography.