<style face="normal" font="default" size="100%">THREE SOLUTIONS FOR A CLASS OF GRADIENT KIRCHHOFF-TYPE SYSTEMS DEPENDING ON TWO PARAMETERS</style>

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<style face="normal" font="default" size="100%">THREE SOLUTIONS FOR A CLASS OF GRADIENT KIRCHHOFF-TYPE SYSTEMS DEPENDING ON TWO PARAMETERS</style>

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<style face="normal" font="default" size="100%">EXISTENCE OF POSITIVE SOLUTIONS FOR PERIODIC BOUNDARY VALUE PROBLEMS WITH IMPULSE EFFECTS</style>