Secondary literature on "The Warden of the Tomb"

Question

The Warden of the Tomb is an expressionist play fragment by Kafka. Although incomplete, possibly extremely so, it's still decently long - about fourteen pages. Sadly (to me at least), as far as I can tell it has received little attention: basically the only writing in English I can find on it are a paper of Burç İdem Dinçel and a (medical!) paper of Mishara. Even in German there seems to be little written on it, with the only example I can find being a paper by Meinel (although since I can't read German it's quite possible I've missed many).

However, I'm not particularly familiar with the field so my "literature search" has been essentially limited to just googling, and I'm well aware that there could be lots of great sources on the topic which aren't so easy to find.

I'm interested in whether there are other sources at least partially focusing on Warden. To avoid asking for a list of references, I'll phrase my question as:

Is there "reasonably serious" secondary literature at least partially focusing on Warden other than the papers mentioned above? Failing that, where are places I might look for such literature?

I'm especially, although not exclusively, interested in sources in English (sadly, that's the only language I can read).

Answer 1

Below are a few references in English:

• S. Zhao (2012): "Kafka, Hamlet and the Modern Psyche's Ecology", Foreign Literature Studies, 34(1):152-159.
  From the abstract: "Shakespeare's Hamlet has special appeal to Franz Kafka, and the two have a deep spiritual relationship. The paper tries to use the relevant records in Kafka's diaries, letters and literary works, especially the play The Warden of the Tomb, to analyze this relationship. (...)"
• Andrew Zuliani: "Kissing the Kolossoi: The Staging of Bare Life", December 2016.
  This article discusses The Warden of the Tomb and other plays in the context of an analysis of Georgio Agamben’s Homo Sacer: Sovereign Power and Bare Life as a "theatrical text".
• Burç DİNÇEL: REPRESENTING THE “OTHER” ON STAGE: A DRAMATURGICAL APPROACH TO FRANZ KAFKA'S “THE WARDEN OF THE TOMB” AND “THE HUNTER GRACCHUS” (Also available in Turkish; already found by the OP.)
• Aaron L Mishara (2010): "Kafka, paranoic doubles and the brain: hypnagogic vs. hyper-reflexive models of disrupted self in neuropsychiatric disorders and anomalous conscious states", Philosophy, Ethics and Humanities in Medicine, 2010; 5: 13. (One paragraph discussing the play; already found by the OP.)
• Peter F. Neumeyer: "Franz Kafka, Sugar Baron", Modern Fiction Studies, Vol. 17, Iss. 1, (Spring 1971): 5. (This apparently mentions the play, but I can't access the full text to find out how much of the text discusses it.)
• Based on search engine results (see Rand al'Thor's comment), the following publication (or part of it) also appears to discuss The Warden of the Tomb but I have not been able to access an abstract or a preview to verify this:
  M. Lazar and R. Gottesman, Eds.: The Dove and the Mole: Kafka's Journey Into Darknenss and Creativity (Interplay, No. 5 (1987 or 1988, depending on the source, see e.g. Open Library)). (Interplay is or was series of conference proceedings published by Undena and should not be confused with the Interplay journal, which began in 2014.)

The footnotes to Katharina Meinel's article that Gareth Rees mentions in a comment contain references to articles in German (not in English); see Heinz Ide and Peter Cersowsky. It is somewhat easier to find German references than English ones:

• Heinz Ide: "Franz Kafka. Der Gruftwächter und Die Truppenaushebung. Zur religiösen Problematik im Kafka-Werk". Jahrbuch der Wittheit zu Bremen. Band 5 (1961): S. 11.
• Peter Cersowsky: "Kafkas philosophisches Drama: Der Gruftwächter". Germanisch-Romanische Monatsschrift, Band 40 (1990): S. 54-65.
• Sandra Fluhrer: "Vorkehrungen gegen das Tragische: Die Gruftwächter-Fragmente". In Sandra Fluhrer's book Konstellationen des Komischen. Beobachtungen des Menschen bei Franz Kafka, Karl Valentin und Samuel Becket. Wilhelm Fink, 2016.

Update: A Franz Kafka Encyclopedia by Richard T. Gray, Ruth V. Gross, Rolf J. Goebel and Clayton Koelb (2005) has an entry on Der Gruftwächter which ends with a short "Further Reading" section that lists the articles by Peter Cersowsky, Heinz Ide and Katharina Meinel that are already listed above. It does not list any secondary literature in English.