Java 8 Method Reference: How to Use it

https://www.codementor.io/eh3rrera/using-java-8-method-reference-du10866vx

Vert.x async coordination (sequential composition aka synchronous executions)

Sequential composition Orchestrate asynchronous executions Source code

Wyszukiwarka podmiotów gospodarki narodowej (REGON, NIP, KRS)

https://wyszukiwarkaregon.stat.gov.pl/ http://www.krs-online.com.pl/sprawdzanie_nip.html

Serbia, Kosovo power grid row delays European clocks

https://www.reuters.com/article/serbia-kosovo-energy/serbia-kosovo-power-grid-row-delays-european-clocks-idUSL5N1QP2FF https://www.entsoe.eu/news-events/announcements/announcements-archive/Pages/News/2018-03-06-press-release-continuing-frequency-deviation-in-the-continental-european-power-system.aspx https://wysokienapiecie.pl/8656-kto-ukradl-prad-za-3-mln-euro-spowolnil-europejskie-zegary/ https://www.swissgrid.ch/swissgrid/en/home/experts/topics/frequency.html

PGP, GPG – bezpieczne szyfrowanie dla każdego

https://osworld.pl/pgp-gpg-bezpieczne-szyfrowanie-dla-kazdego/