$ cat bib.tex
\bibitem{Bertin83}Bertin, J. (1983),
        {\em Semiology of Graphics} (trans. W. Berg).  Madison, WI:
        University of Wisconsin Press.

\bibitem{Bickel75}Bickel, P. J., Hammel, J. W. and O'Connell, J. W.
        (1975).
        Sex bias in graduate admissions: data from Berkeley.  {\em
        Science}, {\it 187}, 398-403.

\bibitem{Farebrother87}Farebrother, R. W. (1987),
        ``Mechanical representations of the ${L}_1$ and ${L}_2$ estimation
        problems'', In Y. Dodge (ed.)  {\em Statistical data analysis
        based on the L1 norm and related methods}, Amsterdam:
        North-Holland., 455-464.

$ perl tex2bib -i bib.tex
items has 4 items
Skipping: ,  in

@Book{Bertin83,
    author      = {Bertin, J.},
    year        = 1983,
    title       = {Semiology of Graphics},
    publisher   = {University of Wisconsin Press},
    address     = {Madison, WI},
    note        = {(trans. W. Berg).}
}
@Article{Bickel75,
    author      = {Bickel, P. J. and Hammel, J. W. and O'Connell, J. W.},
    year        = 1975,
    title       = {Sex Bias in Graduate Admissions: Data from Berkeley},
    journal     = {Science},
    volume      = 187,
    pages       = {398--403}
}
@InCollection{Farebrother87,
    author      = {Farebrother, R. W.},
    year        = 1987,
    title       = {Mechanical Representations of the ${L}_1$ and ${L}_2$ Estimation Problems},
    booktitle   = {Statistical Data Analysis Based on the L1 Norm and Related Methods},
    editor      = {Y. Dodge},
    publisher   = {North-Holland},
    address     = {Amsterdam},
    pages       = {455--464}
}
3 items processed
$