russ tension chord bracing - really necessary

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truss tension chord bracing - really necessary?
a general question that has long been a topic of disagreement within my design office - do trusses (in particular long span steel trusses) need to be laterally braced at the bottom tension chord in order to provide adequate bracing for the vertical web member "columns" to behave as the pin-pin members (k=1.0) that we typically assume in web member design.  
james fisher wrote an excellent paper on this very topic a while back (engineering journal - third quarter 1983).  his article was, however, followed by many dissenting opinions.  
input anyone?
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tension must be laterally braced to meet slenderness ratio.
is there a link that you know of where we could read that article?  that sounds like a good read to me.