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D. A. Ivanov has written:
'Fundamentals of tactical command and control' -- subject(s): Tactics, Command and control systems
Allen E. Scates has written:
'Winning volleyball: fundamentals, tactics and strategy' -- subject(s): Volleyball
'Volleyball' -- subject(s): Volleyball
The correct spelling is "fundamentals."
Fundamentals of Application software?
The plural of fundamental is fundamentals.
As in "these fundamentals are important".