Assertion: raven | /r/HasProperty | critical of the idea
Facets:
value: in a 1969 paper
type: TEMPORAL
Source sentences:
text: In a 1969 paper Ehrlich and Raven were also critical of the idea that the definition of species as advocated by Ernst Mayr, Theodosius Dobzhansky, and G. Ledyard Stebbins had very little meaning for plants.