Photosynthesis and plant development : proceedings of a conference held at the Limburgs Universitair Centrum, Diepenbeek, Belgium, 23-29 July 1978 / edited by R. Marcelle, H. Clijsters & M. Van Poucke. - Marcelle, R; Clijsters, H; Poucke, M Van (Junk ;, 1979)