其实链接中提到的“Article in The Journal of Business · January 1969”有误导，Dhalla的文章名称为Forget the Product Life Cycle Concept!（《哈佛商业评论》1976年1月期 ），该文的脚注2写道——See Rolando Polli and Victor J. Cook’s “A Test of the Product Life Cycle as a Model of Sales Behavior,” Market Science Institute Working Paper, November 1967, p. 43, and also their “Validity of the Product Life Cycle,” The Journal of Business, October 1969, p. 385.，因此and their Validity of the Product Life Cycle其实不是一篇文章的名称，而是Dhalla文章中的一句话。

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