RE: QuestionThe article you are looking for written by D.E. Montoya was published in the InternationalJournal of Rock Mechanics and Mining Sciences - Geomechanics Volume 33 Issue #6 September 1996 To download the article there is a cost of $30.00 here is the address for Science Direct scroll down the page and you will see it listed.https://www.sciencedirect.com/science/journal/01489062
Hope this helps