LAWAL, Abiodun Ismail, and Akande Jide Muili. “Effects of Controllable Blasting Variables on Number of Boulders Generated After Blasting in Ratcon and NSCE Quarries, Ibadan, Oyo State, Nigeria”. International Journal of Engineering & Technology, vol. 2, no. 2, Apr. 2013, pp. 105-12, https://doi.org/10.14419/ijet.v2i2.669.