Hall RR, Beach AD, Baker E and Morison PCA. Nature 232: 131–132
McKenzie AL. Phys. Med. Biol. 31: 967–983
McKenzie AL. Phys. Med. Biol. 28: 905–912
Bayley JG, Kartha VB and Stevens WH. Infrared Phys. 3: 211–233
McKenzie AL. Phys. Med. Biol. 34: in press