A. Hematulin

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III ACKNOWLEDGEMENTS I wish to express my gratitude and deepest appreciation to my " Doktormutter " Professor Dr. Friederike Eckardt-Schupp for her excellent guidance, and kindness encouragement throughout this study. This thesis could not have accomplished without her understanding and gracious assistance. I wish like to express my deepest gratitude to Dr.(More)
The method suggested in the manuscript uses the idea of the hodograph transformation method, which exchanges the independent and dependent variables. Here a change of the independent variables into dependent variables is applied to first derivatives. For the derivatives one obtains a system of differential equations. Group analysis is applied to this(More)
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