Three of the nine specific physical mechanisms are easily addressed (EDM and electrostatic cleaning of the surfaces of comets, electrostatic deposition of dust and debris on their surfaces) - the 21 page PDF contains no external references, and only the following internal ones (simple re-statements omitted):

- the image titled "Carving of Surface Relief" has a caption which includes "the surface on the right, produced by electric discharge machining (EDM)" (note there's nothing to say whether "electrical discharge machining" is the same as "electric discharge machining" or not)

- "The jets flare up and move over the nucleus irregularly, leaving scars typical of electric discharge machining" - this repeats the link of EDM to the action of jets ("The observed jets of comets are electric arc discharges to the nucleus")

- "The asteroid appears to have attracted considerable surface debris electrostatically".

Note that the first time the terms "electrical discharge machining" and "electrostatic cleaning" are used, they are in quote marks, signifying that they have special, non-standard meanings (if the authors follow a common orthographic convention) ... yet no definitions are given.

So two of the three mechanisms are empty - you could rewrite the parts of the document which mention them using nonsense words (e.g. "invisible elves") and they would have just the same meaning.

EDM is linked to "jets"; next post I shall examine five(of the other six) mechanisms (the formation of coma and tail, of jets and filaments, maintenance of coma and filaments, emission of x-rays) and also look at whether there's any more meat to EDM than there is to "electrostatic cleaning" or "attracted back to the nucleus electrostatically".