DOE:10.2151/jmsj.79.985 DOE:10.2151/jmsj.82.1599 DOE:10.2151/jmsj.82.1695 DOE:10.2151/jmsj.84.891 DOE:10.2151/jmsj.85A.439 DOE:10.2151/sola.2011-041 DOE:10.2151/sola.2013-011 DOE:10.2151/sola.2016-045