Rojas, B. <br/><br/>
The modified latin square 

<br/><br/> Sobretiro de : Journal of the Royal Statistical Society. Ser. B. 19 (2) : 305- 317, 1957 
<br/><br/><label>LCCN: </label>51290 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cuadrados.