1. Amir, D. ‘On Jung’s constant and related constants in normed linear spaces’, Pacific J. Math. 118 (1985), 1–15.
2. Brimberg, J. and Love, R.F. ‘Estimating travel distances by the weighted i p norm’, Naval Res. Logist Quart, to appear.
3. Eilon, S., Watson-Gandy, C.D.T., and Christofides, N. Distribution management: mathematical modelling and practical analysis, Griffin, London 1971.
4. Erlenkotter, D. ‘The general optimal market area model’, preprint (Los Angeles, May 1987).
5. Freimer, M. and Yu, P.L. ‘Some new results on compromise solutions for group decision problems’, Management Sci. 22 (1976), 688–693.