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  Schwinger's Variational Principles - Google-Suche

  http://www.google.de/search?hl=de&source=hp&q=Schwinger's+Variational+Principles+&meta=&aq=f&oq=

  Keine Beschreibung vorhanden.

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  Total Cross Sections for Negative and Positive Pions in Hydrogen and Deuterium - INSPIRE-HEP

  http://inspirehep.net/record/48035?ln=de

  External meson beams, ranging in energy from 135 Mev to 260 Mev for the π−, and 135 Mev to 198 Mev for the π+, have been used for the measurement of total cross sections by an attenuation experiment using liquid hydrogen as well as CH2 and C as absorbers.…

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