Aiuto con bibtex, causa errore strano.

Salve ragazzi!

Una domandina:

io ho un paper in latex che sto scrivendo e tutto andava bene fin quando ho tentato di inserire ciò nella bibliografia:

`
@incollection {springerlink:10.1007/978-3-642-03655-2_30,
author = {Balagtas-Fernandez, Florence and Forrai, Jenny and Hussmann, Heinrich},
affiliation = {Media Informatics Group, Department of Computer Science, University of Munich, Germany},
title = {Evaluation of User Interface Design and Input Methods for Applications on Mobile Touch Screen Devices},
booktitle = {Human-Computer Interaction – INTERACT 2009},
series = {Lecture Notes in Computer Science},
editor = {Gross, Tom and Gulliksen, Jan and Kotzé, Paula and Oestreicher, Lars and Palanque, Philippe and Prates, Raquel and Winckler, Marco},
publisher = {Springer Berlin / Heidelberg},
isbn = {978-3-642-03654-5},
keyword = {Computer Science},
pages = {243-246},
volume = {5726},
url = {http://dx.doi.org/10.1007/978-3-642-03655-2_30},
note = {10.1007/978-3-642-03655-2_30},
year = {2009}
}
`

ho altri articoli in bibliogafia e non mi avevano mai dato problemi.
invece dopo che inserisco questo mi dà questi errori:

`

! Missing $ inserted.

$
l.10 \newblock 10.1007/978-3-642-03655-2_
30.
I've inserted a begin-math/end-math symbol since I think
you left one out. Proceed, with fingers crossed.
! Missing $ inserted.

$
l.11
I've inserted a begin-math/end-math symbol since I think
you left one out. Proceed, with fingers crossed.
! Missing } inserted.

}
l.11
I've inserted something that you may have forgotten.
(See the above.)
With luck, this will get me unwedged. But if you
really didn't forget anything, try typing `2' now; then
my insertion and my current dilemma will both disappear.
! Extra }, or forgotten \endgroup.
\par …m \@noitemerr {\@@par }\fi \else {\@@par }
\fi
l.11
I've deleted a group-closing symbol because it seems to be
spurious, as in `$x}$'. But perhaps the } is legitimate and
you forgot something else, as in `\hbox{$x}'. In such cases
the way to recover is to insert both the forgotten and the
deleted material, e.g., by typing `I$}'.
) [37
] [38
] (./web.bbl
LaTeX Font Info: Try loading font information for T1+lmtt on input line 6.
(c:/texlive/2010/texmf-dist/tex/latex/lm/t1lmtt.fd
File: t1lmtt.fd 2009/10/30 v1.6 Font defs for Latin Modern
)

`

se levo quell’articolo dalla bibliografia tutto funziona.

Sapete dirmi perché?
Grazie 🙂