Look at the reply I gave to the user you replied to. I listed the parts of the sources I used. I found really difficult to find a unified notation, but that's t

Look at the reply I gave to the user you replied to. I listed the parts of the sources I used. I found really difficult to find a unified notation, but that's the sense. Try to read the parts I listed, and check if it's more understandable to you. Apologies for the late reply. Technical problems.