1. L.M. Blumenthal,Theory and Applications of Distance Geometry (Chelsea Publ. Co., Bronx, New York, 1970).
2. G.M. Crippen and T.F. Havel,Distance Geometry and Molecular Conformation, in:Chemometrics Research Studies Series, ed. D. Bawden, Research Studies Press (Wiley, New York, 1988).
3. A.W.M. Dress and T.F. Havel, SIAM J. Discr. Math. (1991), in press.
4. J.B. Saxe, Embeddability of weighted graphs ink-space is strongly NP-hard, in:17th Auerton Conf. on Communication, Control and Computing (1979), pp. 480-489.
5. J.E. Goodman and R. Pollack, SIAM J. Comput. 12 (1983)484?507.