Perhaps you should try some spelling variations:
"mathematische modell of cognitive processes and neural networks" » "mathematische modelle of cognitive processes and neural networks", "mathematisches modell of cognitive processes and neural networks", "mathematischen modells of cognitive processes and neural networks", "mathematische modell of cognitive process and neural networks"
"mathematical model of cognitive processes and neural networks" » "mathematical models of cognitive processes and neural networks", "mathematical modeling of cognitive processes and neural networks", "mathematical methods of cognitive processes and neural networks", "mathematical model of cognitive process and neural networks"

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