All homogeneous sphere packings were derived that refer to the trivariant lattice complexes of monoclinic space-group types P2/c and P21/c. In total, sphere packings of 55 types have been found. The maximal inherent symmetry is monoclinic for 17 types while the other types comprise at least one sphere packing with cubic (four cases), hexagonal (six cases), tetragonal (eight cases) or orthorhombic (20 cases) symmetry.

中文翻译：

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单斜球填料。三．P2/c 和 P21/c 的三变晶格配合物

推导了所有均质球堆积，涉及单斜空间群类型的三变晶格复合体磷2/C和磷21/C。总共已发现 55 种球填料。17 种类型的最大固有对称性是单斜晶系，而其他类型则包含至少一种具有立方（4 种）、六方（6 种）、四方（8 种）或斜方（20 种）对称性的球体堆积。