TY - RPRT TI - Surface energy formula for a Hsieh-Clough-Tocher Element AU - McClain, Marjorie AU - Witzgall, Christoph PY - 1999 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 6246 DO - 10.6028/NIST.IR.6246 ER -