Perhaps you should try some spelling variations:
"de frontiers prodeedings in mathematics" » "de frontiers proceedings in mathematics", "de frontiers pioneering in mathematics", "de frontiers producing in mathematics", "de frontiere prodeedings in mathematics", "_ frontiers prodeedings in mathematics", "12 frontiers prodeedings in mathematics"
"one frontier proceedings in mathematics" » "one frontiers proceedings in mathematics", "one other proceedings in mathematics", "one further proceedings in mathematics", "von frontier proceedings in mathematics", "online frontier proceedings in mathematics", "close frontier proceedings in mathematics"

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