Implications of Recent Research into the Application of Graded Particles or Micro-Proppants for Coal Seam Gas and Shale Hydraulic Fracturing January 1, 2022 R Johnson H Ramanandraibe N Di Vaira C Leonardi Z You V Santiago A Ribeiro A Badalyan P Bedrikovetsky A Zeinijahromi T Carageorgos A Sanchez-Barr R Chalaturnyk N Deisman Publications