Programming complex objects in spreadsheets: an empirical study comparing textual formula entry with direct manipulation and gestures. - Herkimer J. Gottfried; Margaret M. Burnett (ESP, 1997)

Graphical Definitions: Making Spreadsheets Visual Through Direct Manipulation and Gestures. - Herkimer J. Gottfried; Margaret M. Burnett (VL, 1997)

Graphical Definitions: Expanding Spreadsheet Languages Through Direct Manipulation and Gestures. - Margaret M. Burnett; Herkimer J. Gottfried (ACM Trans. Comput. Hum. Interact., 1998)

Forms/3: A first-order visual language to explore the boundaries of the spreadsheet paradigm. - Margaret M. Burnett; John Atwood; Rebecca Walpole Djang; James Reichwein; Herkimer J. Gottfried; Sherry Yang 002 (J. Funct. Program., 2001)