... It was necessary to construct quite a different type of parachute to be light, compact, encased in a parapack and reliable. At first most parachute designers considered it to be hardly possible for a canopy to open in the air without the aid of some special devices, such as an umbrella spokes, compressed air or powder explosive charges. ... Later on a great number of different parachute systems were worked out and introduced by Russian parachute designers Nikolai Lobanov, Igor Glushkov and others. ...

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• On Square Parachute Differential Equations

The beamer class Manual for version 3.06. \begin{frame} \frametitle{There Is No Largest Prime Number} \framesubtitle{The proof uses \textit{reductio ad absurdum}.} \begin{theorem} There is no largest prime number. \end{theorem} \begin{proof} \begin{enumerate} \item<1-| alert@1> Suppose $p$ were the largest prime number. \item<2-> Let $q$ be the product of the first $p$ numbers. \item<3-> Then $q+1$ is not divisible by any of them. \item<1-> Thus $q+1$ is also prime and greater than $p$.\qedhere

365. http://www.umo.msu.ru/docs/poop/poop-inf-mag.doc

366. http://mguteam.chat.ru/stad1.html