This terminology was notably explored in the work of Bożena Ostromęcka-Frączak, particularly in her 1983 publication, Czasowniki polskie z formatem rozdzielonym (Polish Verbs with Separated Format). Key Feature: The "Separable" Nature of Się
: While it is part of the verb's meaning, "się" can move within a sentence depending on rhythm and emphasis.
For further academic detail, you can access the original monograph through the University of Łódź Repository or CEEOL.