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Continue to ChatOn the invariants of trajectory ruled surfaces - https://avesis.kocaeli.edu.tr/yayin/7a32460f-4bae-433a-82b9-0033351ee57c/on-the-invariants-of-trajectory-ruled-surfaces
On the invariants of trajectory ruled surfaces - https://avesis.kocaeli.edu.tr/yayin/7a32460f-4bae-433a-82b9-0033351ee57c/on-the-invariants-of-trajectory-ruled-surfaces