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@Stefan_K!

Thank you very much! You saved my day!

Hello!

I want to create a matrix having one row and multiple columns. I am doing it as follows:

\usepackage{amsmath}
\begin{equation}
y(k)=
\begin{bmatrix}
a_{0}&a_{1}&a_{2}&b_{1}&b_{2}&c_{1}&c_{2}&d_{1}&d_{2}&e_{1}&e{2}
\end{bmatrix}
\end{equation}

I am getting the error:

! Extra alignment ...

I found a simpler way:

url = "http://www.x-plane.com/pg\textunderscore reviews.html"

Thank you. I will try this out and get back if the problem persists.

Hello!

I am new to this forum as well as BiBTeX. I am writing a research paper in which I want the following citation:
@electronic{xplaneworks,
title = "How {X}-{P}lane {W}orks",
url = "http://www.x-plane.com/pg_reviews.html",
month = "August",
year = "2009"
}
This generates strange errors ...