by LaMarca, H.L., Ott, C.M., Höner zu Bentrup, K., LeBlanc, C.L., Pierson, D.L., Nelson, A.B., Scandurro, A.B., Whitley, G. St. J., Nickerson, C.A., Morris, C.A.
Published in Placenta (Eastbourne) (01.11.2005)

by Woollett, R.S., Leblanc, C.L.
Published in IEEE transactions on sonics and ultrasonics (01.01.1973)