Instead of shortening "IEEE Transactions on Geoscience and Remote Sensing" to "IEEE Trans. Geosci. Remote Sens." as specified here, can I instead shorten it to "IEEE TGRS"? The journal web site uses this abbreviation, and its DOIs have the TGRS prefix. I need to shorten the references as much as possible and this could save multiple lines.
If instead I see that the journal itself doesn't use an abbreviation or it doesn't appear in the DOIs, should I then stick to traditional word-by-word abbreviations?