2 literature references for Macrobiotus walteri Biserov, 1998:

Author: Guidetti, Roberto, and Roberto Bertolani
Year: 2005
Title: Tardigrade taxonomy: an updated check list of the taxa and a list of characters for their identification
Source: Zootaxa, issue 845
Author: Biserov, Vladimir I.
Year: 1998
Title: Tardigrades of the Caucasus with a Taxonomic Analysis of the Genus Ramazzottius (Parachela: Hypsibiidae)
Source: Zoologischer Anzeiger, vol. 236, no. 2-3