• Integrating small and medium-sized ports into green shipping corridors : a case study of Sillamäe-Kotka ferry lineHrenov, Georgi; Bark, Eunice O.; Prause, Gunnar Klaus; Gerstlberger, Wolfgang DieterTransport and telecommunication journal2025 / p. 373-385 https://doi.org/10.2478/ttj-2025-0029 https://reference-global.com/article/10.2478/ttj-2025-0029
  • Sillamäe–Kotka: koridor rohelisemasse maailmaHrenov, Georgi; Gerstlberger, Wolfgang Dietertrialoog.taltech.ee2026 https://trialoog.taltech.ee/sillamae-kotka-koridor-rohelisemasse-maailma/