USDA:10.2980/15-2-3027
USDA:10.2980/17-3-3326
USDA:10.2980/20-3-3620
USDA:10.2980/1195-6860(2006)13[44:SASOPB]2.0.CO;2
USDA:10.2980/1195-6860(2007)14[40:LCOALF]2.0.CO;2
USDA:10.2980/i1195-6860-12-4-519.1