Microsoft Academic Search v2 requires a subscription key from Microsoft.
Please consult the Help file.

Microsoft Academic Search v2 (part of Microsoft Cognitive Services) requires an individual subscription key for each user to access the service. The subscription is currently available free of charge from Microsoft, but does require you to register a Microsoft Account if you do not have one already.

For more information, please visit the Microsoft Academic Knowledge API site and follow the instructions to obtain a free subscription key.

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