1. Can homeopaths detect homeopathic medicines? A pilot study for a randomised, double-blind, placebo controlled investigation of the proving hypothesis;Vickers;Br Homeopath J,2001
2. Empirical evidence for a non-classical experimenter effect. An experimental, double-blind investigation of unconventional information transfer;Walach;J Sci Explor,1997
3. Unconventional water detection: Field test of the dowsing technique in dry zones: part 1;Betz;J Sci Explor,1995
4. Unconventional water detection: Field test of the dowsing technique in dry zones: part 2;Betz;J Sci Explor,1995