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- [7] MAN HAS TO LIVE WITH HIMSELF AND HE SHOULD SEE TO IT THAT HE ALWAYS HAS GOOD COMPANY RESEARCH-DEVELOPMENT, 1970, 21 (12): : 13 - &
- [8] WHEN A MAN HAS PUT A LIMIT ON WHAT HE WILL DO, HE HAS PUT A LIMIT ON WHAT HE CAN DO RESEARCH-DEVELOPMENT, 1970, 21 (06): : 6 - &