▁by ▁John ▁B . ▁H att endorf ▁( 1 9 9 4 ) ▁Th ir teenth ▁International ▁Se ap ower ▁Sym pos ium : ▁report ▁of ▁proceed ings ▁of ▁the ▁conference , ▁ 5 – 8 ▁November ▁ 1 9 9 5 ▁edited ▁by ▁John ▁B . ▁H att endorf ▁( 1 9 9 5 ) ▁Four teenth ▁International ▁Se ap ower ▁Sym pos ium : ▁report ▁of ▁the ▁proceed ings ▁of ▁the ▁conference , ▁ 2 – 5 ▁November ▁ 1 9 9 7 ▁edited ▁by ▁John ▁B . ▁H att endorf ▁( 1 9 9 8 ) ▁Six teenth ▁International ▁Se ap ower ▁Sym pos ium : ▁report ▁of ▁the ▁proceed ings ▁ 2 6 – 2 9 ▁October ▁ 2 0 0 3 , ▁edited ▁by ▁John ▁B . ▁H att endorf ▁( 2 0 0 4 ) Se vent e enth ▁International ▁Se ap ower ▁Sym pos ium : ▁report ▁of ▁the ▁proceed ings ▁ 1 9 – 2 3 ▁September ▁ 2 0 0 5 , ▁edited ▁by ▁John ▁B . ▁H att endorf ▁( 2 0 0 6 ) ▁E igh teenth ▁International ▁Se ap ower ▁Sym pos ium : ▁report ▁of ▁the ▁proceed ings ▁ 1 7 – 1 9 ▁October ▁ 2 0 0 7 , ▁edited ▁by ▁John ▁B . ▁H att endorf ▁with ▁John ▁W . ▁Kennedy ▁( 2 0 0 9 ) N in ete enth ▁International ▁Se ap ower ▁Sym pos ium : ▁report ▁of ▁the ▁proceed ings ▁ 6 –