1. G. M. Baule andR. McFee:Am. Heart J.,66, 95 (1963).
2. G. M. Baule andR. McFee:Am. Heart J.,79, 223 (1970).
3. J. P. Wikswo jr: Ph. D. Dissertation, Stanford University, U.S.A. 91975).
4. M. Saarinen, P. J. Karp, T. E. Katila andP. Siltanen:Cardiovasc. Res.,8, 820 (1974).
5. D. Cohen, H. Hosaka, E. Lepeschkin, H. D. Levine, B. F. Massell, D. McCaughan andG. Myers:Report of the low-field group: The magnetocardiogram, Massachusetts Institute of Technology (Boston, Mass., 1975), p. 2.