April 2000	VOLUME 25	NUMBER 2	IJOEDY	(ISSN 0364-9059)

NONTECHNICAL CONTENT
		Front cover and table of contents
		Back cover
PAPERS
Andrew A. Bennett and John J. Leonard		A behavior-based approach to adaptive feature detection and following with autonomous underwater vehicles		213
Massimo Caccia, Giovanni Indiveri, and Gianmarco Veruggio		Modeling and identification of open-frame variable configuration unmanned underwater vehicles		227
Thor I. Fossen and Mogens Blanke		Nonlinear output feedback control of underwater vehicle propellers using feedback form estimated axial flow velocity		241
Melvin J. Hinich		A statistical theory of signal coherence		256
Kainam T. Wong and Michael D. Zoltowski		Self-initiating MUSIC-based direction finding in underwater acoustic particle velocity-field beamspace		262