@article{CTT100715547,
  author = {Ernesto Kalaw Martin and Alvin Culaba and Hirofumi Hinode and Winarto Kurniawan and Susan Gallardo and Michael Angelo Promentilla},
  title = {Optimizing and Characterizing Geopolymers from Ternary Blend of Philippine Coal Fly Ash, Coal Bottom Ash and Rice Hull Ash},
  journal = {Materials},
  year = 2016,
}

@inproceedings{CTT100756277,
  author = {Kalaw M. and Culaba A. and Hinode H. and Kurniawan W. and Nguyen, H.T. and Nguyen, K. and Gallardo. S. and Promentilla, M.A.},
  title = {Mechanical and thermal properties of geopolymers from mixtures of coal ash and rice hull ash using water glass solution as activator},
  booktitle = {ASEAN Journal of Chemical Engineering},
  year = 2015,
}