This paper is also interesting as the last author is Michael Richardson who is at the same time responsible for perhaps the most detailed scientific critique of Haeckel's work, in specific reference to fraudulent/misleading diagrams, and the best defense of the importance of Haeckel's work in general in the wider context of evo-devo.
I presume you are referring to the following, which I don't think has been previously posted in this topic:
Haeckel's ABC of evolution and development.pdf
MK Rich Ardson - MK Blog Rich:
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The pdf is not currently available, but hopefully will come back.
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