APA (7th ed.) Citation

Karhumäki, J., & Hirsch, E. (2015). Preface. Theory of Computing Systems, 56(4), 591. https://doi.org/10.1007/s00224-015-9618-4

Chicago Style (17th ed.) Citation

Karhumäki, J., and E. Hirsch. "Preface." Theory of Computing Systems 56, no. 4 (2015): 591. https://doi.org/10.1007/s00224-015-9618-4.

MLA (9th ed.) Citation

Karhumäki, J., and E. Hirsch. "Preface." Theory of Computing Systems, vol. 56, no. 4, 2015, p. 591, https://doi.org/10.1007/s00224-015-9618-4.