I was going through the book Handbook of Product Graphs by Sandi Sir et. al. They have mentioned in detail about all the graph products. I am more curious about the history of these products. I mean who defined these products and in which year. From searching on the web, I got to know only about Tensor product of graphs. Can anyone help me by providing desired sites and info from where I can get these details? It will mean a lot to me. Thanks a lot for the help.
PS: Does the following pic indicate that in this article the graph product was first introduced?
