by Sikkema, J.K., Ong, S.K., Alleman, J.E.
Published in Construction & building materials (15.12.2015)

by Sikkema, J.K., Van der Werff, J.R.
Published in Koers (Potchefstroom, South Africa) (01.01.2015)

by Sikkema, J.K., Vander Werff, J.R.
Published in Koers (Potchefstroom, South Africa) (2015)