501
Journal article icon

504
Conference item icon

505
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506
Journal article icon

511
Journal article icon

514
Journal article icon

515
Journal article icon

516
Journal article icon

519
Journal article icon

522
Journal article icon

523
Journal article icon

524
Journal article icon

525
Journal article icon

529
Journal article icon

531
Journal article icon

532
Book section icon

533
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536
Journal article icon

537
Book section icon

538
Book section icon

539
Journal article icon

541
Journal article icon

543
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544
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545
Journal article icon

551
Book section icon

553
Working paper icon

557
Journal article icon

559
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