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- [3] DEATHS RELATED TO PNEUMOENCEPHALOGRAPHY DURING A 6-YEAR PERIOD AMA ARCHIVES OF NEUROLOGY AND PSYCHIATRY, 1951, 65 (04): : 463 - 471
- [4] RICE AND THE 6-YEAR GRACE PERIOD - OPPORTUNITY FOR REALISM JAPAN QUARTERLY, 1994, 41 (02): : 157 - 164