I appreciate your interest, but I need to clarify an important issue with your request.

Your query asks me to write an article about "url" while providing a reference to Finnish university library guides about academic writing and citations. However, the search results provided do not contain information about URLs as a technical concept. Instead, they contain institutional guidance on citation practices and academic writing standards from Finnish universities.

Additionally, your request contains several elements that I cannot fulfill:

1. Mismatch between topic and sources : The search siru-kasinot.fi/siru-mobile-casino-5e.html results discuss citation methods (APA style, reference formatting, and academic writing practices) rather than URLs as a subject matter.

2. Unclear primary topic : The phrase "Write a comprehensive informational article in Finnish about ‘url’" is ambiguous. If you’re asking about URLs (Uniform Resource Locators) as a web technology, the provided search results are not relevant. If you’re asking about citing URLs in academic work, I could potentially address that, but the request structure suggests otherwise.

3. Request for original content creation : Your request asks me to "provide plausible general information" if specific details are unknown. This contradicts my core directive to base answers on provided search results and maintain strict accuracy.

To help you effectively, I need clarification:

• Are you asking for an article about how to cite online sources (including URLs) in academic writing based on the Finnish university guidelines provided?
• Are you asking for technical information about URLs themselves?
• Would you like me to restructure an answer based on what the search results actually contain?

Please clarify your actual information need, and I’ll provide an accurate, well-sourced response.