It should be "as follows". Both of your uses of "has" should be "have".
Interested in Language
I want to know "as follow" is correct or "as follows". Which is correct?
Thanks for your comment, it is corrected in paper as follow:
Takao et al.  has investigated variable blade thickness Wells turbines experimentally. They has indicated that the stall characteristic depends on the blade profile at tip and totally, the stall point is improved by increasing blade thickness at the blade tip.
Last edited by ali_dd; 26-Sep-2015 at 12:10.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.