hey laaz thanks for the link, a lot of useful stuff could be found there.
today i cut open the fruit and took few pics.
although it seemed to be pretty firm and semi ripe from outside, inside of the fruit was soft and looking great, with an exception...
this might be the reason of premature fruit drop, however the taste of the rest of the fruit was incredible...
a unique mix of sweet and tart citrus flavor. probably the best i have ever tasted. definitely.