Bibtopic/Archival

Hello,

I'm having trouble when using together bibtopic and the 
alpha-stage-but-so-oh-so-necessary-to-historians @archival entry.
The use of bibtopic on a file containing @archival entries mangles the 
order of the entries in the bibliography : see minimal example below.

So two questions :
1- Is is me, or has anybody else encountered the same issue ?
The manual mentions compatibility between jurabib and bibtopic, as long 
as short titles are mentioned : but the archives have -- alas -- no 
titles. Could that be the origin of the problem ?
However, adding fake titles to references didn't solve the problem.

2- How do you people do ? Is there another solution either to cite 
archives' references, or to make separate bibliographies ? (I have 
three files, archives, printed sources, modern historiography).

Thanks !

-- Hélène.

--
\documentclass{book}%
\usepackage[applemac]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[english,latin,frenchb]{babel}

% \usepackage{bibtopic}
\usepackage{jurabib}


\begin{document}

\bibliographystyle{jurabib}

\chapter{début}

Ceci est un texte inepte\footcite{ars5414} qui est destiné à
vérifier certaines\footcite{bn5185} fonctions\footcite{dupuy480}
de jurabib-archival.
\cite{bn18431}


\bibliography{SourcesManuscrites}

% \begin{btSect}{SourcesManuscrites}
%    \section{Sources manuscrites}
%    \btPrintCited
% \end{btSect}

\end{document}

-- .bib file :
@ARCHIVAL{ars5414,
    archive         = {Bibliothèque de l'Arsenal},
    shortarchive    = {Bibl. Arsenal},
    subarchive      = {Recueil Conrart},
    sig1            = {5414},
}
@ARCHIVAL{bn5185,
    archive =         {Bibliothèque nationale},
    shortarchive =    {B.N.},
    subarchive =      {Manuscrits français},
    shortsubarchive = {Ms.},
    sig1 =            {5185},
}
@ARCHIVAL{bn18431,
    archive         = {Bibliothèque nationale},
    shortarchive    = {B.N.},
    subarchive      = {Manuscrits français},
    shortsubarchive = {Ms.},
    sig1            = {18431},
}
@ARCHIVAL{dupuy480,
    archive         = {Bibliothèque nationale},
    shortarchive    = {B.N.},
    subarchive      = {Collection Dupuy},
    shortsubarchive = {coll. Dupuy},
    sig1            = {480},
}


 
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