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Here is a simple problem to do with delimiters in LaTeX. Suppose you make
frequent references to Scientific American and decide to define a macro to
do it for you. You want to type "\sciamref{date}{page no.}". Here is a
possibility

**********************************
\documentstyle[11pt]{report}

\def\sciamref#1#2
% #1 is the date, #2 the page number
    {({\em Sci.\ Am.}\enspace#1, p.\hskip2pt#2)}

\begin{document}

%Two examples of its use:

This approach has been tried before \sciamref{May 1989}{54}.

See our previous article \sciamref{September 1983}{72} for details.

\end{document}
**********************************

but it doesn't work. The first line comes out as

...tried before (Sci. Am. May 1989, p. 54.)
                                         ^
[the final fullstop has come inside the bracket, even though it was
outside the } in the input file.]


The second line comes out as

...article (Sci. Am. September 1983, p. 72)for details
                                           ^
[there is no space between the closing bracket and the "for details"].

What is going wrong?

Thanks for any help,

J.