1. Abacus Concepts (1991) StatView. Abacus Concepts, Berkeley, CA
2. Christians NE (1991) Preemergence weed control using corn gluten meal. US patent 5,030,268
3. Christians NE (1993) The use of corn gluten meal as a natural preemergence weed control in turf. In: Carrow RN, Christians NE, Shearman RC (eds) International Turfgrass Society Research Journal. Intertec Publishing, Overland Park, KS, pp 284–290
4. Christians NE, Garbutt JT, Liu DL (1994) Preemergence weed control using plant protein hydrolysate. US patent 5,290,749
5. Lax AR, Shepherd HS, Edwards JV (1988) Tentoxin, a chlorosis-inducing toxin for Alternaria as a potential herbicide. Weed Technol 2:540–544