Vanlauwe, B., Diels, J., Sanginga, P., Carsky, R., Deckers, J., & Merckx, R. (2000). Utilization of rock phosphate by crops on a representative toposequence in the northern Guinea savanna zone of Nigeria: Response by maize to previous herbaceous legume cropping and rock phospate treatments. Elsevier.

Vanlauwe, Bernard, J. Diels, P. Sanginga, R.J Carsky, J. Deckers, e R. Merckx. Utilization of Rock Phosphate by Crops on a Representative Toposequence in the Northern Guinea Savanna Zone of Nigeria: Response by Maize to Previous Herbaceous Legume Cropping and Rock Phospate Treatments. Elsevier, 2000.

Vanlauwe, Bernard, et al. Utilization of Rock Phosphate by Crops on a Representative Toposequence in the Northern Guinea Savanna Zone of Nigeria: Response by Maize to Previous Herbaceous Legume Cropping and Rock Phospate Treatments. Elsevier, 2000.

Vanlauwe, B., Diels, J., Sanginga, P., Carsky, R., Deckers, J., ; Merckx, R. 2000. Utilization of rock phosphate by crops on a representative toposequence in the northern Guinea savanna zone of Nigeria: Response by maize to previous herbaceous legume cropping and rock phospate treatments. Elsevier.