Then the numerous other treatises attributed to Sun Tzǔ 36 might also be included. The fact that the Han Chih mentions no work of Sun Tzǔ except the 82 pʽien , whereas the Sui and Tʽang bibliographies give the titles of others in addition to the “13 chapters,” is good proof, Pi I-hsün thinks, that all of these were contained in the 82 pʽien . Without pinning our faith to the accuracy of details supplied by the Wu Yüeh Chʽun Chʽiu , or admitting the genuineness of any of the treatises cited by Pi I-hsün