Having read your article published in the last issue of 10th January I would like to add some comments....

Having read.... This is because 'reading' would suggest that the action is continuing and isn't yet completed. Words ending in -ing are typically a type of noun in English referred to as a Gerund. In simpler terms where you see -ing words think of the word 'doing'. As opposed to done, which suggests completion, 'doing' implies the action is not yet completed and is a guiding rule for most nouns ending with -ing. See more examples below: Listening watching Looking Dancing Talking Fighting