hpb: must validate against the CSL 1.0.1 schema
Please check your style at http://validator.citationstyles.org/

expected `[[21, "21:0: ERROR: Did not expect element locale there"], [21, "21:0: ERROR: Element style has extra content: locale"], [2, "2:0: ERROR: Expecting element locale, got style"]].empty?` to return true, got false

1,2
3,4

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1. Hancké B, Rhodes M, Thatcher M, editors (2007). Beyond Varieties of Capitalism : Conflict, Contradiction, and Complementarities in the European Economy. Oxford University Press, Oxford and New York.
2. CSL search by example (2012). Citation Style Editor. Available at: http://editor.citationstyles.org/searchByExample/ [Accessed December 15, 2012].
3. Mares I (2001). Firms and the Welfare State: When, Why, and How Does Social Policy Matter to Employers? In: Hall PA, Soskice D, editors. Varieties of Capitalism. The Institutional Foundations of Comparative Advantage, Oxford University Press, New York, p. 184–213.
4. Fenner M, Crosas M, Grethe JS, Kennedy D, Hermjakob H, Rocca-Serra P, Durand G, Berjon R, et al (2019). A Data Citation Roadmap for Scholarly Data Repositories. Scientific Data 6: 28. https://doi.org/10.1038/s41597-019-0031-8.

1,2
3,4

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1. Hancké B, Rhodes M, Thatcher M, editors (2007). Beyond Varieties of Capitalism : Conflict, Contradiction, and Complementarities in the European Economy. Oxford University Press, Oxford and New York.
2. CSL search by example (2012). Citation Style Editor. Available at: http://editor.citationstyles.org/searchByExample/ [Accessed December 15, 2012].
3. Mares I (2001). Firms and the Welfare State: When, Why, and How Does Social Policy Matter to Employers? In: Hall PA, Soskice D, editors. Varieties of Capitalism. The Institutional Foundations of Comparative Advantage, Oxford University Press, New York, p. 184–213.
4. Fenner M, Crosas M, Grethe JS, Kennedy D, Hermjakob H, Rocca-Serra P, Durand G, Berjon R, et al (2019). A Data Citation Roadmap for Scholarly Data Repositories. Scientific Data 6: 28. https://doi.org/10.1038/s41597-019-0031-8.