2 literature references for Rotaria quadrioculata (Murray, 1902):

Author: Donner J
Year: 1965
Title: Ordnung Bdelloidea (Rotatoria, Rädertiere)
Source: Bestimmungsbücher zur Bodenfauna Europas 6. Akademie-Verlag, Berlin, 297pp.
Author: Berzinš B
Year: 1982a
Title: Die Unterarten von Dissotrocha aculeata (macrostyla)
Source: Private publication, Lund, 10pp., 4 plates