Googled it :-) Helsing attributed it to Jelliffe (1978)
War on Want attributed it to ref #13 in The Baby Killer by Muller,1974,
however the ref page isn't on the web site, just the body of the pamphlet. I
did a quick look in CBI, but can't come up with pamphlet. Maybe Virgina has
that one. Pat in SNJ
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