TY - RPRT TI - Tetraploid conceptus with three paternal contributions. AU - D M Sheppard AU - R A Fisher AU - S D Lawler AU - S Povey PY - 1982 DO - 10.1007/bf00304561 UR - https://pubmed.ncbi.nlm.nih.gov/7166315/ ID - 7166315 ER -