[1]膝厚山.一类曲面族包络的求解问题[J].济南大学学报(综合版),1998,{4}(02):60-61+64.

Teng Houshan. THE QUESTION FOR FINDING THE SOLUTION OF THE ENVELOPING OF A CLASS SURFACE FAMILY[J]. Journal of University of Jinan(Social Science Edition), 1998,(2):60-61.

[1]膝厚山.一类曲面族包络的求解问题[J].济南大学学报(综合版),1998,{4}(02):60-61+64. DOI：

Teng Houshan. THE QUESTION FOR FINDING THE SOLUTION OF THE ENVELOPING OF A CLASS SURFACE FAMILY[J]. Journal of University of Jinan(Social Science Edition), 1998,(2):60-61. DOI：