Hari-namamrta-vyakarana - fundamental
Gaudia Vaishnava grammar by
Jiva Goswami.
(literally, "The Grammar of the Nectar of the Names of
Hari") of Jiva is a unique
Sanskrit grammar in which all the technical terms in the sutras are names of
Krishna or his associates.

There also exists an abridged version of the work published as
Sanksepa-hari-namamrta-vyakarana.
Example
For example the meter of the first pāda - quarter of maha mantra, is like this:
| - S - S - | - | - S - S - S -> the last syllable in a pāda may be optionally guru as in the case of the last syllable
the syllable re is guru and is also guru because it is followed by a double consonant
S -| - S - | - | - S- | -S
hare rāma hare rāma rāma rāma hare hare
All meters of
4 syllables are called
5 syllables are called
6 syllables are called
7 syllables are called
8 syllables are called etc.
References
Sushil Kumar De
Early History of the Vaisnava Faith and Movement in Bengal -p. 157. 1961, 703 pages