“…As Lima [22] pointed out, these 0932-0784 / 09 / 1200-0819 $ 06.00 c 2009 Verlag der Zeitschrift für Naturforschung, Tübingen · http://znaturforsch.com nonlinear equations arise in many fields of science and technology, such as acoustic vibrations [2], oscillations in small molecules [21], oscillations of buildings during earthquakes [25], post-buckling in cantilever columns [26], optically torqued nanorods [27], Josephson superconductivity junctions [21,28], elliptic filters for electronic devices [21], analysis of smectic C liquid crystals [29], gravitational lensing in general relativity [30], advanced models in field theory [31], and others.…”