C e<chr_var letter="s" var="long">∫</chr_var>e<chr_var letter="s" var="long">∫</chr_var>tu b<chr_abbr type="reg" class="dc" expan="" cert="no">n-hbar</chr_abbr> certa<chr_abbr type="reg" class="dc" expan="in" cert="no">i-hbar</chr_abbr>ne<chr_abbr type="reg" class="dc" expan="" cert="no">mt-hbar</chr_abbr> 