Hello. 
I`ve got an expierence with theese guys http://algebraiccompositionq.vblogetin.com/13932875/????-??-??-??
http://trigonometricexpositiong.newbigblog.com/14082050/????-??????????-??-??-??-??-????a-??
https://measurablearticleg.answerblogs.com/10849695/????????-??????
  that were mentioned before. 
And I watned to say thanks!

AnthonyBress