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through-truss without top chord bracing

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Can any of you recommend a reference for the design of a through-truss (pony truss?) without top chord bracing?  I have seen trusses - such as gangways - where the top chord "appears" to be unbraced.  In actuality, they must use the stiffness of the vertical web members to resist the lateral buckling of the top chord because there is no way for the top chord to be considered as unbraced for the entire span of the truss and still be able to take much compressive load.  Are any of you familiar with a design procedure for this type of system?
Thanks in advance,
Kenneth S. Peoples, P. E.
Lehigh Valley Technical Associates
1584 Weaversville Road
Northampton, PA 18067-9039
Phone: (610) 262-6345
Fax: (610) 262-8188
e-mail: kpeoples(--nospam--at)