《后汉书·列传·马援列传》
子舆传给了西河仪长孺，长孺传给了茂陵丁君都，君都传给了成纪杨子阿，我曾经拜子阿为师，接受了相马骨法。
子舆传西河仪长孺，长孺传茂陵丁君都，君群传成纪杨子阿，臣援尝师事子阿，受相马骨法。
Ziyu passed his knowledge on to Xihe Yichangru, who passed it on to Maoling Ding Junchen, who passed it on to Chengji Yang Zian. I once studied horse physiognomy from Zian.