Direct manipulation of free-form deformations. Hsu, W. M., Hughes, J. F., & Kaufman, H. ACM SIGGRAPH Computer Graphics, 26(2):177–184, Association for Computing Machinery (ACM), July, 1992.
doi  bibtex   
@Article{Hsu1992,
    author      = {William M. Hsu and John F. Hughes and Henry Kaufman},
    title       = {Direct manipulation of free-form deformations},
    doi         = {10.1145/142920.134036},
    journal     = {{ACM} {SIGGRAPH} Computer Graphics},
    month       = {July},
    number      = {2},
    pages       = {177--184},
    publisher   = {Association for Computing Machinery ({ACM})},
    volume      = {26},
    year        = {1992}
}

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