Context: An influential school of phonology in the interwar period was the Prague school. One of its leading members was Prince Nikolai Trubetzkoy, whose Grundzüge der Phonologie (Principles of Phonology), published posthumously in 1939, is among the most important works in the field from this period. Directly influenced by Baudouin de Courtenay, Trubetzkoy is considered the founder of morphophonology, although this concept had also been recognized by de Courtenay. Trubetzkoy also developed the concept of the archiphoneme. Another important figure in the Prague school was Roman Jakobson, who was one of the most prominent linguists of the 20th century.

Question: What was Nikolai Trubetzkoy's publication?
Answer: Principles of Phonology

Question: When was Principles of Phonology published?
Answer: 1939

Question: What is Trubetzkoy considered to have founded?
Answer: morphophonology

Question: What school was Trubetzkoy a member of?
Answer: the Prague school.

Question: What was Trubetzkoy's title?
Answer: Prince

Question: What was Baudouin de Courtenay's publication?
Answer: Unanswerable

Question: When was Principles of Phonology made into a movie?
Answer: Unanswerable

Question: What is de Courtenay considered to have founded?
Answer: Unanswerable

Question: What school was de Courtenay a member of?
Answer: Unanswerable

Question: What was de Courtenay's title?
Answer: Unanswerable