N. P. Kefford

Enhancement of lettuce seed germination by some urea derivatives

M. Bruce, J. Zwar, N. P. Kefford, 1965, Planta.

Chemical structure and plant kinin activity— the activity of urea and thiourea derivatives

M. Bruce, J. Zwar, N. P. Kefford, 1965 .

Cytokinin activities of phenylurea derivatives — Bud growth

M. Bruce, J. Zwar, N. P. Kefford, 1966, Planta.

Retardation of leaf senescence by urea cytokinins in Raphanus sativus

M. Bruce, J. Zwar, N. P. Kefford, 1973 .